255402 has 24 divisors (see below), whose sum is σ = 632736. Its totient is φ = 72936.

The previous prime is 255383. The next prime is 255413. The reversal of 255402 is 204552.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

255402 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 888 + ... + 1139.

It is an arithmetic number, because the mean of its divisors is an integer number (26364).

2²⁵⁵⁴⁰² is an apocalyptic number.

255402 is an abundant number, since it is smaller than the sum of its proper divisors (377334).

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

255402 is a wasteful number, since it uses less digits than its factorization.

255402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2042 (or 2039 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 18.

The square root of 255402 is about 505.3731294796. The cubic root of 255402 is about 63.4465626031.

Adding to 255402 its reverse (204552), we get a palindrome (459954).

The spelling of 255402 in words is "two hundred fifty-five thousand, four hundred two".