865056 has 24 divisors (see below), whose sum is σ = 2271024. Its totient is φ = 288320.

The previous prime is 865049. The next prime is 865057. The reversal of 865056 is 650568.

It is a tau number, because it is divible by the number of its divisors (24).

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (865057) by changing a digit.

865056 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4410 + ... + 4601.

It is an arithmetic number, because the mean of its divisors is an integer number (94626).

2⁸⁶⁵⁰⁵⁶ is an apocalyptic number.

It is an amenable number.

865056 is an abundant number, since it is smaller than the sum of its proper divisors (1405968).

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

865056 is a wasteful number, since it uses less digits than its factorization.

865056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9024 (or 9016 counting only the distinct ones).

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

The square root of 865056 is about 930.0838671862. The cubic root of 865056 is about 95.2828504570.

The spelling of 865056 in words is "eight hundred sixty-five thousand, fifty-six".