256818 has 16 divisors (see below), whose sum is σ = 536256. Its totient is φ = 81840.

The previous prime is 256813. The next prime is 256831. The reversal of 256818 is 818652.

It is not an unprimeable number, because it can be changed into a prime (256813) 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 7 ways as a sum of consecutive naturals, for example, 793 + ... + 1068.

It is an arithmetic number, because the mean of its divisors is an integer number (33516).

2²⁵⁶⁸¹⁸ is an apocalyptic number.

256818 is an abundant number, since it is smaller than the sum of its proper divisors (279438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256818 is a wasteful number, since it uses less digits than its factorization.

256818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1889.

The product of its digits is 3840, while the sum is 30.

The square root of 256818 is about 506.7721381449. The cubic root of 256818 is about 63.5636000724.

The spelling of 256818 in words is "two hundred fifty-six thousand, eight hundred eighteen".