256965 has 16 divisors (see below), whose sum is σ = 423168. Its totient is φ = 133056.

The previous prime is 256957. The next prime is 256967. The reversal of 256965 is 569652.

It is not a de Polignac number, because 256965 - 2³ = 256957 is a prime.

It is a super-2 number, since 2×256965² = 132062022450, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

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 256965.

It is not an unprimeable number, because it can be changed into a prime (256967) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 324 + ... + 786.

It is an arithmetic number, because the mean of its divisors is an integer number (26448).

2²⁵⁶⁹⁶⁵ is an apocalyptic number.

It is an amenable number.

256965 is a deficient number, since it is larger than the sum of its proper divisors (166203).

256965 is a wasteful number, since it uses less digits than its factorization.

256965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508.

The product of its digits is 16200, while the sum is 33.

The square root of 256965 is about 506.9171529945. The cubic root of 256965 is about 63.5757254777.

It can be divided in two parts, 256 and 965, that added together give a palindrome (1221).

The spelling of 256965 in words is "two hundred fifty-six thousand, nine hundred sixty-five".