256455 has 24 divisors (see below), whose sum is σ = 458640. Its totient is φ = 132480.

The previous prime is 256441. The next prime is 256469. The reversal of 256455 is 554652.

It is an interprime number because it is at equal distance from previous prime (256441) and next prime (256469).

It is not a de Polignac number, because 256455 - 2⁵ = 256423 is a prime.

256455 is a lucky number.

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 256455.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1776 + ... + 1914.

It is an arithmetic number, because the mean of its divisors is an integer number (19110).

2²⁵⁶⁴⁵⁵ is an apocalyptic number.

256455 is a deficient number, since it is larger than the sum of its proper divisors (202185).

256455 is a wasteful number, since it uses less digits than its factorization.

256455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191 (or 188 counting only the distinct ones).

The product of its digits is 6000, while the sum is 27.

The square root of 256455 is about 506.4138623695. The cubic root of 256455 is about 63.5336379118.

The spelling of 256455 in words is "two hundred fifty-six thousand, four hundred fifty-five".