865256 has 16 divisors (see below), whose sum is σ = 1854240. Its totient is φ = 370800.

The previous prime is 865253. The next prime is 865259. The reversal of 865256 is 652568.

Added to its reverse (652568) it gives a square (1517824 = 1232²).

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (865253) and next prime (865259).

It is a plaindrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (865253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7670 + ... + 7781.

It is an arithmetic number, because the mean of its divisors is an integer number (115890).

2⁸⁶⁵²⁵⁶ is an apocalyptic number.

It is an amenable number.

865256 is an abundant number, since it is smaller than the sum of its proper divisors (988984).

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

865256 is a wasteful number, since it uses less digits than its factorization.

865256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15464 (or 15460 counting only the distinct ones).

The product of its digits is 14400, while the sum is 32.

The square root of 865256 is about 930.1913781583. The cubic root of 865256 is about 95.2901929880.

Adding to 865256 its reverse (652568), we get a square (1517824 = 1232²).

The spelling of 865256 in words is "eight hundred sixty-five thousand, two hundred fifty-six".