256923 has 6 divisors (see below), whose sum is σ = 371124. Its totient is φ = 171276.

The previous prime is 256903. The next prime is 256931. The reversal of 256923 is 329652.

It is not a de Polignac number, because 256923 - 2¹² = 252827 is a prime.

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

256923 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (256903) 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 5 ways as a sum of consecutive naturals, for example, 14265 + ... + 14282.

It is an arithmetic number, because the mean of its divisors is an integer number (61854).

2²⁵⁶⁹²³ is an apocalyptic number.

256923 is a deficient number, since it is larger than the sum of its proper divisors (114201).

256923 is a wasteful number, since it uses less digits than its factorization.

256923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28553 (or 28550 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 256923 is about 506.8757244138. The cubic root of 256923 is about 63.5722615482.

The spelling of 256923 in words is "two hundred fifty-six thousand, nine hundred twenty-three".