255399 has 4 divisors (see below), whose sum is σ = 340536. Its totient is φ = 170264.

The previous prime is 255383. The next prime is 255413. The reversal of 255399 is 993552.

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 255399 - 2⁴ = 255383 is a prime.

It is a d-powerful number, because it can be written as 2⁵ + 5 + 3¹¹ + 5⁷ + 9 + 9² .

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42564 + ... + 42569.

It is an arithmetic number, because the mean of its divisors is an integer number (85134).

2²⁵⁵³⁹⁹ is an apocalyptic number.

255399 is a deficient number, since it is larger than the sum of its proper divisors (85137).

255399 is an equidigital number, since it uses as much as digits as its factorization.

255399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85136.

The product of its digits is 12150, while the sum is 33.

The square root of 255399 is about 505.3701613669. The cubic root of 255399 is about 63.4463141837.

The spelling of 255399 in words is "two hundred fifty-five thousand, three hundred ninety-nine".