3665840 has 20 divisors (see below), whose sum is σ = 8523264. Its totient is φ = 1466304.

The previous prime is 3665839. The next prime is 3665869. The reversal of 3665840 is 485663.

It is a tau number, because it is divible by the number of its divisors (20).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 3665797 and 3665806.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22832 + ... + 22991.

Almost surely, 2^3665840 is an apocalyptic number.

It is an amenable number.

3665840 is an abundant number, since it is smaller than the sum of its proper divisors (4857424).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3665840 is a wasteful number, since it uses less digits than its factorization.

3665840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45836 (or 45830 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 3665840 is about 1914.6383470515. The cubic root of 3665840 is about 154.1905775753.

The spelling of 3665840 in words is "three million, six hundred sixty-five thousand, eight hundred forty".