256218 has 8 divisors (see below), whose sum is σ = 512448. Its totient is φ = 85404.

The previous prime is 256211. The next prime is 256219. The reversal of 256218 is 812652.

It is a sphenic number, since it is the product of 3 distinct primes.

256218 is an admirable number.

It is an Ulam number.

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (256211) 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 3 ways as a sum of consecutive naturals, for example, 21346 + ... + 21357.

It is an arithmetic number, because the mean of its divisors is an integer number (64056).

2²⁵⁶²¹⁸ is an apocalyptic number.

256218 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

256218 is a wasteful number, since it uses less digits than its factorization.

256218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42708.

The product of its digits is 960, while the sum is 24.

The square root of 256218 is about 506.1798099490. The cubic root of 256218 is about 63.5140605812.

It can be divided in two parts, 256 and 218, that added together give a palindrome (474).

The spelling of 256218 in words is "two hundred fifty-six thousand, two hundred eighteen".