255138 has 16 divisors (see below), whose sum is σ = 549696. Its totient is φ = 78480.

The previous prime is 255137. The next prime is 255149. The reversal of 255138 is 831552.

255138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 255138.

It is not an unprimeable number, because it can be changed into a prime (255133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1558 + ... + 1713.

It is an arithmetic number, because the mean of its divisors is an integer number (34356).

2²⁵⁵¹³⁸ is an apocalyptic number.

255138 is an abundant number, since it is smaller than the sum of its proper divisors (294558).

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

255138 is a wasteful number, since it uses less digits than its factorization.

255138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3289.

The product of its digits is 1200, while the sum is 24.

The square root of 255138 is about 505.1118687974. Note that the first 3 decimals coincide. The cubic root of 255138 is about 63.4246942451.

It can be divided in two parts, 255 and 138, that added together give a palindrome (393).

The spelling of 255138 in words is "two hundred fifty-five thousand, one hundred thirty-eight".