256807 has 4 divisors (see below), whose sum is σ = 260496. Its totient is φ = 253120.

The previous prime is 256801. The next prime is 256813. The reversal of 256807 is 708652.

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

It is an interprime number because it is at equal distance from previous prime (256801) and next prime (256813).

It is a cyclic number.

It is not a de Polignac number, because 256807 - 2³ = 256799 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 (256801) 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, 1738 + ... + 1879.

It is an arithmetic number, because the mean of its divisors is an integer number (65124).

2²⁵⁶⁸⁰⁷ is an apocalyptic number.

256807 is a deficient number, since it is larger than the sum of its proper divisors (3689).

256807 is an equidigital number, since it uses as much as digits as its factorization.

256807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3688.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 256807 is about 506.7612850248. The cubic root of 256807 is about 63.5626925431.

The spelling of 256807 in words is "two hundred fifty-six thousand, eight hundred seven".