255642 has 16 divisors (see below), whose sum is σ = 516672. Its totient is φ = 84320.

The previous prime is 255641. The next prime is 255649. The reversal of 255642 is 246552.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255641) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 667 + ... + 977.

It is an arithmetic number, because the mean of its divisors is an integer number (32292).

2²⁵⁵⁶⁴² is an apocalyptic number.

255642 is an abundant number, since it is smaller than the sum of its proper divisors (261030).

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

255642 is a wasteful number, since it uses less digits than its factorization.

255642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453.

The product of its digits is 2400, while the sum is 24.

The square root of 255642 is about 505.6105220424. The cubic root of 255642 is about 63.4664298554.

The spelling of 255642 in words is "two hundred fifty-five thousand, six hundred forty-two".