#line 1 "test/yukicoder/880.test.cpp"
#define PROBLEM "https://yukicoder.me/problems/no/880"
#line 2 "template.hpp"
// #pragma GCC target("avx2")
// #pragma GCC optimize("O3")
// #pragma GCC optimize("unroll-loops")

#include <bits/stdc++.h>
using namespace std;
// https://xn--kst.jp/blog/2019/08/29/cpp-comp/
// debug methods
// usage: debug(x,y);
// vector 出力できるように修正
template <typename T>
ostream& debug_print(ostream& os, const vector<T>& v) {
    os << "[";
    for (size_t i = 0; i < v.size(); ++i) {
        os << v[i];
        if (i < v.size() - 1) os << ", ";
    }
    os << "]";
    return os;
}
template <typename T>
ostream& debug_print(ostream& os, const T& var) {
    os << var;
    return os;
}
#define CHOOSE(a) CHOOSE2 a
#define CHOOSE2(a0, a1, a2, a3, a4, x, ...) x
#define debug_1(x1) { cout << #x1 << ": "; debug_print(cout, x1) << endl; }
#define debug_2(x1, x2) { cout << #x1 << ": "; debug_print(cout, x1) << ", " << #x2 << ": "; debug_print(cout, x2) << endl; }
#define debug_3(x1, x2, x3) { cout << #x1 << ": "; debug_print(cout, x1) << ", " << #x2 << ": "; debug_print(cout, x2) << ", " << #x3 << ": "; debug_print(cout, x3) << endl; }
#define debug_4(x1, x2, x3, x4) { cout << #x1 << ": "; debug_print(cout, x1) << ", " << #x2 << ": "; debug_print(cout, x2) << ", " << #x3 << ": "; debug_print(cout, x3) << ", " << #x4 << ": "; debug_print(cout, x4) << endl; }
#define debug_5(x1, x2, x3, x4, x5) { cout << #x1 << ": "; debug_print(cout, x1) << ", " << #x2 << ": "; debug_print(cout, x2) << ", " << #x3 << ": "; debug_print(cout, x3) << ", " << #x4 << ": "; debug_print(cout, x4) << ", " << #x5 << ": "; debug_print(cout, x5) << endl; }

#ifdef LOCAL
#define debug(...) CHOOSE((__VA_ARGS__, debug_5, debug_4, debug_3, debug_2, debug_1, ~))(__VA_ARGS__)
#else
#define debug(...)
#endif

using ll = long long;
using vl = vector<ll>;
using Graph = vector<vector<ll>>;
using P = pair<ll, ll>;
#define all(v) v.begin(), v.end()
template <typename T> inline bool chmax(T &a, T b) {
    return ((a < b) ? (a = b, true) : (false));
}
template <typename T> inline bool chmin(T &a, T b) {
    return ((a > b) ? (a = b, true) : (false));
}
#define rep1(i, n) for(ll i = 1; i <= ((ll)n); ++i)
// https://trap.jp/post/1224/
template <class... T> constexpr auto min(T... a) {
    return min(initializer_list<common_type_t<T...>>{a...});
}
template <class... T> constexpr auto max(T... a) {
    return max(initializer_list<common_type_t<T...>>{a...});
}
template <class... T> void input(T &...a) { (cin >> ... >> a); }
template <class T> void input(vector<T> &a) {
    for(T &x : a)
        cin >> x;
}
void print() { cout << '\n'; }
template <class T, class... Ts> void print(const T &a, const Ts &...b) {
    cout << a;
    (cout << ... << (cout << ' ', b));
    cout << '\n';
}
void print(const string &s) {
    cout << s << '\n';
}
template <class Container, typename = void>
struct is_container : std::false_type {};
template <class Container>
struct is_container<Container, std::void_t<decltype(std::declval<Container>().begin()), decltype(std::declval<Container>().end())>> : std::true_type {};
template <class Container>
typename enable_if<is_container<Container>::value>::type print(const Container& x) {
    if (!x.empty()) {
        auto it = x.begin();
        for (; it != prev(x.end()); ++it) {
            cout << *it << " ";
        }
        cout << *it << "\n";  // 最後の要素を出力して改行
    }
}
#define INT(...)                                                               \
    int __VA_ARGS__;                                                           \
    input(__VA_ARGS__)
#define LL(...)                                                                \
    long long __VA_ARGS__;                                                     \
    input(__VA_ARGS__)
#define STR(...)                                                               \
    string __VA_ARGS__;                                                        \
    input(__VA_ARGS__)
#define REP1(a) for(ll i = 0; i < a; i++)
#define REP2(i, a) for(ll i = 0; i < a; i++)
#define REP3(i, a, b) for(ll i = a; i < b; i++)
#define REP4(i, a, b, c) for(ll i = a; i < b; i += c)
#define overload4(a, b, c, d, e, ...) e
#define rep(...) overload4(__VA_ARGS__, REP4, REP3, REP2, REP1)(__VA_ARGS__)

ll inf = 3e18;
vl dx = {1, -1, 0, 0};
vl dy = {0, 0, 1, -1};
#line 2 "data_structure/segtree-beats.hpp"
// https://rsm9.hatenablog.com/entry/2021/02/01/220408

template <class S, S (*op)(S, S), S (*e)(), class F, S (*mapping)(F, S),
          F (*composition)(F, F), F (*id)()>
//   composition(f,g)(x) = f∘g(x) = f(g(x))
// aclと同じ、maspyさん記事と逆
struct segtree_beats {
    vector<S> v;
    vector<F> vf;
    ll n;
    segtree_beats(ll n)
        : n(n), v(vector<S>(2 * n, e())), vf(vector<F>(2 * n, id())) {};
    segtree_beats(vector<S> v_) : n(v_.size()) {
        vf = vector<F>(2 * n, id());
        v = vector<S>(2 * n, e());
        rep(i, n) { v[i + n] = v_[i]; }
        for(ll i = n - 1; i > 0; i--) {
            v[i] = op(v[i << 1], v[i << 1 | 1]);
        }
    }
    void apply(ll l, ll r, F f) {
        l += n;
        r += n;
        ll l0 = l / (l & -l);
        ll r0 = r / (r & -r) - 1;
        propagate_above(l0);
        propagate_above(r0);
        while(l < r) {
            if(l & 1) {
                apply_at(l, f);
                l++;
            }
            if(r & 1) {
                r--;
                apply_at(r, f);
            }
            l >>= 1;
            r >>= 1;
        }
        recul_above(l0);
        recul_above(r0);
    }
    S get(ll x) {
        x += n;
        ll maxi = bit_length(x) - 1;
        for(ll i = maxi; i > 0; i--) {
            propagate_at(x >> i);
        }
        return v[x];
    }
    void set(ll x, S s) {
        x += n;
        propagate_above(x);
        v[x] = s;
        recul_above(x);
    }
    S prod(ll l, ll r) {
        l += n;
        r += n;
        ll l0 = l / (l & -l);
        ll r0 = r / (r & -r) - 1;
        propagate_above(l0);
        propagate_above(r0);
        S sl = e(), sr = e();
        while(l < r) {
            if(l & 1) {
                sl = op(sl, v[l]);
                l++;
            }
            if(r & 1) {
                r--;
                sr = op(v[r], sr);
            }
            l >>= 1;
            r >>= 1;
        }
        return op(sl, sr);
    }

  private:
    void apply_at(ll x, F f) {
        v[x] = mapping(f, v[x]);
        if(x < n) {
            vf[x] = composition(f, vf[x]);
            // Added for Segment Tree Beats implementation.
            if(v[x].fail) {
                propagate_at(x);
                v[x] = op(v[x << 1], v[x << 1 | 1]);
            }
        }
    }
    void propagate_at(ll x) {
        apply_at(x << 1, vf[x]);
        apply_at(x << 1 | 1, vf[x]);
        vf[x] = id();
    }
    ll bit_length(unsigned long long x) { return 64 - countl_zero(x); }
    void propagate_above(ll x) {
        ll maxi = bit_length(x) - 1;
        for(ll i = maxi; i > 0; i--) {
            propagate_at(x >> i);
        }
        return;
    }
    void recul_above(ll x) {
        while(x > 1) {
            x >>= 1;
            v[x] = op(v[x << 1], v[x << 1 | 1]);
        }
    }
};
#line 4 "test/yukicoder/880.test.cpp"
struct S {
    ll mini, maxi, lcm, num, sum;
    bool fail;
    S(ll a, ll num_ = 1)
        : mini(a), maxi(a), lcm(a), num(num_), sum(a * num_), fail(false) {};
    S() = default;
};
S e() { return S(0, 0); }
S op(S a, S b) {
    S res = e();
    res.mini = min(a.mini, b.mini);
    res.maxi = max(a.maxi, b.maxi);
    res.lcm = lcm(a.lcm, b.lcm);
    if(a.lcm == inf or b.lcm == inf or
       __int128_t(a.lcm) * b.lcm / (1 + gcd(a.lcm, b.lcm)) >= inf)
        res.lcm = inf;
    res.num = a.num + b.num;
    res.sum = a.sum + b.sum;
    res.fail = a.fail or b.fail;
    return res;
}
struct F {
    // gcdやってassign
    bool gcd_q, assing_q;
    ll g, x;
};
S mapping(F f, S s) {
    if(s.fail) {
        return s;
    }
    if(f.assing_q) {
        return S(f.x, s.num);
    }
    if(f.gcd_q) {
        if(s.mini == s.maxi) {
            ll val = gcd(s.mini, f.g);
            return S(val, s.num);
        }
        if(f.g % s.lcm)
            s.fail = true;
    }
    return s;
}
F id() { return F(false, false, 0, 0); }
F composition(F f1, F f2) {
    if(f1.assing_q or (!f2.assing_q and !f2.gcd_q)) {
        return f1;
    }
    if(!f1.gcd_q) {
        return f2;
    }
    if(f2.assing_q) {
        return F(false, true, 0, gcd(f1.g, f2.x));
    }
    f1.g = gcd(f1.g, f2.g);
    return f1;
}
void solve() {
    LL(n, q);
    vector<S> a(n);
    rep(i, n) {
        LL(ai);
        a[i] = S(ai);
    }
    segtree_beats<S, op, e, F, mapping, composition, id> seg(a);
    while(q--) {
        LL(flag);
        LL(l, r);
        l--;
        if(flag == 1) {
            LL(x);
            seg.apply(l, r, F(false, true, 0, x));
        } else if(flag == 2) {
            LL(x);
            seg.apply(l, r, F(true, false, x, 0));
        } else if(flag == 3) {
            print(seg.prod(l, r).maxi);
        } else {
            print(seg.prod(l, r).sum);
        }
    }
}
int main() {
    ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
    ll t = 1;
    rep(_, t) solve();
}