256927 has 4 divisors (see below), whose sum is σ = 280296. Its totient is φ = 233560.

The previous prime is 256903. The next prime is 256931. The reversal of 256927 is 729652.

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 256927 - 2⁷ = 256799 is a prime.

It is a super-2 number, since 2×256927² = 132022966658, which contains 22 as substring.

It is an Ulam number.

It is a d-powerful number, because it can be written as 2 + 5⁷ + 9³ + 6⁶ + 2¹⁷ + 7³ .

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256957) 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, 11668 + ... + 11689.

It is an arithmetic number, because the mean of its divisors is an integer number (70074).

2²⁵⁶⁹²⁷ is an apocalyptic number.

256927 is a deficient number, since it is larger than the sum of its proper divisors (23369).

256927 is a wasteful number, since it uses less digits than its factorization.

256927 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23368.

The product of its digits is 7560, while the sum is 31.

The square root of 256927 is about 506.8796701388. The cubic root of 256927 is about 63.5725914625.

The spelling of 256927 in words is "two hundred fifty-six thousand, nine hundred twenty-seven".