256427 has 4 divisors (see below), whose sum is σ = 267600. Its totient is φ = 245256.

The previous prime is 256423. The next prime is 256441. The reversal of 256427 is 724652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 256427 - 2² = 256423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256396 and 256405.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 256427.

It is not an unprimeable number, because it can be changed into a prime (256423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5552 + ... + 5597.

It is an arithmetic number, because the mean of its divisors is an integer number (66900).

2²⁵⁶⁴²⁷ is an apocalyptic number.

256427 is a deficient number, since it is larger than the sum of its proper divisors (11173).

256427 is a wasteful number, since it uses less digits than its factorization.

256427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11172.

The product of its digits is 3360, while the sum is 26.

The square root of 256427 is about 506.3862162421. The cubic root of 256427 is about 63.5313256067.

The spelling of 256427 in words is "two hundred fifty-six thousand, four hundred twenty-seven".