399255 has 16 divisors (see below), whose sum is σ = 654720. Its totient is φ = 207648.

The previous prime is 399241. The next prime is 399263. The reversal of 399255 is 552993.

It is not a de Polignac number, because 399255 - 2⁴ = 399239 is a prime.

It is a congruent number.

It is an unprimeable 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 15 ways as a sum of consecutive naturals, for example, 336 + ... + 954.

It is an arithmetic number, because the mean of its divisors is an integer number (40920).

2³⁹⁹²⁵⁵ is an apocalyptic number.

399255 is a deficient number, since it is larger than the sum of its proper divisors (255465).

399255 is a wasteful number, since it uses less digits than its factorization.

399255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670.

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

The square root of 399255 is about 631.8662833227. The cubic root of 399255 is about 73.6348581533.

The spelling of 399255 in words is "three hundred ninety-nine thousand, two hundred fifty-five".