255439 has 4 divisors (see below), whose sum is σ = 257224. Its totient is φ = 253656.

The previous prime is 255419. The next prime is 255443. The reversal of 255439 is 934552.

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

It is a cyclic number.

It is not a de Polignac number, because 255439 - 2⁹ = 254927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 657 + ... + 970.

It is an arithmetic number, because the mean of its divisors is an integer number (64306).

2²⁵⁵⁴³⁹ is an apocalyptic number.

255439 is a deficient number, since it is larger than the sum of its proper divisors (1785).

255439 is a wasteful number, since it uses less digits than its factorization.

255439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1784.

The product of its digits is 5400, while the sum is 28.

The square root of 255439 is about 505.4097347697. The cubic root of 255439 is about 63.4496262824.

It can be divided in two parts, 25543 and 9, that added together give a palindrome (25552).

The spelling of 255439 in words is "two hundred fifty-five thousand, four hundred thirty-nine".