256339 has 4 divisors (see below), whose sum is σ = 264640. Its totient is φ = 248040.

The previous prime is 256337. The next prime is 256349. The reversal of 256339 is 933652.

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 256339 - 2¹ = 256337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256337) 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, 4104 + ... + 4165.

It is an arithmetic number, because the mean of its divisors is an integer number (66160).

2²⁵⁶³³⁹ is an apocalyptic number.

256339 is a deficient number, since it is larger than the sum of its proper divisors (8301).

256339 is an equidigital number, since it uses as much as digits as its factorization.

256339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8300.

The product of its digits is 4860, while the sum is 28.

The square root of 256339 is about 506.2993185854. The cubic root of 256339 is about 63.5240572661.

It can be divided in two parts, 256 and 339, that added together give a palindrome (595).

The spelling of 256339 in words is "two hundred fifty-six thousand, three hundred thirty-nine".