256042 has 4 divisors (see below), whose sum is σ = 384066. Its totient is φ = 128020.

The previous prime is 256033. The next prime is 256049. The reversal of 256042 is 240652.

256042 is digitally balanced in base 2, 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., 251001 + 5041 = 501^2 + 71^2 .

It is a zygodrome in base 4.

It is not an unprimeable number, because it can be changed into a prime (256049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64009 + ... + 64012.

256042 is a Friedman number, since it can be written as 6+(502+4)^2, using all its digits and the basic arithmetic operations.

2²⁵⁶⁰⁴² is an apocalyptic number.

256042 is a deficient number, since it is larger than the sum of its proper divisors (128024).

256042 is a wasteful number, since it uses less digits than its factorization.

256042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128023.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 256042 is about 506.0059288190. The cubic root of 256042 is about 63.4995143286.

Adding to 256042 its reverse (240652), we get a palindrome (496694).

The spelling of 256042 in words is "two hundred fifty-six thousand, forty-two".