865560 has 32 divisors (see below), whose sum is σ = 2597040. Its totient is φ = 230784.

The previous prime is 865537. The next prime is 865577. The reversal of 865560 is 65568.

It is a super-2 number, since 2×865560² = 1498388227200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 865560.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3487 + ... + 3726.

2⁸⁶⁵⁵⁶⁰ is an apocalyptic number.

It is an amenable number.

865560 is an abundant number, since it is smaller than the sum of its proper divisors (1731480).

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

865560 is a wasteful number, since it uses less digits than its factorization.

865560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7227 (or 7223 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 865560 is about 930.3547710417. The cubic root of 865560 is about 95.3013514686.

The spelling of 865560 in words is "eight hundred sixty-five thousand, five hundred sixty".