256365 has 24 divisors (see below), whose sum is σ = 463008. Its totient is φ = 136080.

The previous prime is 256363. The next prime is 256369. The reversal of 256365 is 563652.

256365 is a `hidden beast` number, since 25 + 636 + 5 = 666.

It is not a de Polignac number, because 256365 - 2¹ = 256363 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a d-powerful number, because it can be written as 2⁴ + 5⁶ + 3¹¹ + 6⁴ + 6⁶ + 5⁶ .

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 256365.

It is not an unprimeable number, because it can be changed into a prime (256363) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1110 + ... + 1320.

It is an arithmetic number, because the mean of its divisors is an integer number (19292).

2²⁵⁶³⁶⁵ is an apocalyptic number.

It is an amenable number.

256365 is a deficient number, since it is larger than the sum of its proper divisors (206643).

256365 is an equidigital number, since it uses as much as digits as its factorization.

256365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231 (or 219 counting only the distinct ones).

The product of its digits is 5400, while the sum is 27.

The square root of 256365 is about 506.3249944453. The cubic root of 256365 is about 63.5262049035.

It can be divided in two parts, 2563 and 65, that added together give a triangular number (2628 = T₇₂).

The spelling of 256365 in words is "two hundred fifty-six thousand, three hundred sixty-five".