256847 has 4 divisors (see below), whose sum is σ = 257880. Its totient is φ = 255816.

The previous prime is 256831. The next prime is 256873. The reversal of 256847 is 748652.

256847 is nontrivially palindromic in base 6.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 256847 - 2⁴ = 256831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113 + ... + 725.

It is an arithmetic number, because the mean of its divisors is an integer number (64470).

2²⁵⁶⁸⁴⁷ is an apocalyptic number.

256847 is a deficient number, since it is larger than the sum of its proper divisors (1033).

256847 is an equidigital number, since it uses as much as digits as its factorization.

256847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1032.

The product of its digits is 13440, while the sum is 32.

The square root of 256847 is about 506.8007498021. The cubic root of 256847 is about 63.5659925255.

The spelling of 256847 in words is "two hundred fifty-six thousand, eight hundred forty-seven".