255438 has 24 divisors (see below), whose sum is σ = 578448. Its totient is φ = 81312.

The previous prime is 255419. The next prime is 255443. The reversal of 255438 is 834552.

255438 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

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 255438.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 106 + ... + 722.

It is an arithmetic number, because the mean of its divisors is an integer number (24102).

2²⁵⁵⁴³⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 255438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (289224).

255438 is an abundant number, since it is smaller than the sum of its proper divisors (323010).

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

255438 is a wasteful number, since it uses less digits than its factorization.

255438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648 (or 645 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 255438 is about 505.4087454724. The cubic root of 255438 is about 63.4495434842.

The spelling of 255438 in words is "two hundred fifty-five thousand, four hundred thirty-eight".