255839 has 2 divisors, whose sum is σ = 255840. Its totient is φ = 255838.

The previous prime is 255803. The next prime is 255841. The reversal of 255839 is 938552.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255839 is a prime.

Together with 255841, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127919 + 127920.

It is an arithmetic number, because the mean of its divisors is an integer number (127920).

2²⁵⁵⁸³⁹ is an apocalyptic number.

255839 is a deficient number, since it is larger than the sum of its proper divisors (1).

255839 is an equidigital number, since it uses as much as digits as its factorization.

255839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 32.

The square root of 255839 is about 505.8052985092. The cubic root of 255839 is about 63.4827282681.

The spelling of 255839 in words is "two hundred fifty-five thousand, eight hundred thirty-nine".