256442 has 4 divisors (see below), whose sum is σ = 384666. Its totient is φ = 128220.

The previous prime is 256441. The next prime is 256469. The reversal of 256442 is 244652.

256442 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 219961 + 36481 = 469^2 + 191^2 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 256442.

It is not an unprimeable number, because it can be changed into a prime (256441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64109 + ... + 64112.

2²⁵⁶⁴⁴² is an apocalyptic number.

256442 is a deficient number, since it is larger than the sum of its proper divisors (128224).

256442 is a wasteful number, since it uses less digits than its factorization.

256442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128223.

The product of its digits is 1920, while the sum is 23.

The square root of 256442 is about 506.4010268552. The cubic root of 256442 is about 63.5325643625.

The spelling of 256442 in words is "two hundred fifty-six thousand, four hundred forty-two".