399015331 has 24 divisors (see below), whose sum is σ = 475224624. Its totient is φ = 330281280.

The previous prime is 399015329. The next prime is 399015349. The reversal of 399015331 is 133510993.

It is not a de Polignac number, because 399015331 - 2¹ = 399015329 is a prime.

It is a super-2 number, since 2×399015331² = 318426468746079122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399015301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2306361 + ... + 2306533.

It is an arithmetic number, because the mean of its divisors is an integer number (19801026).

Almost surely, 2^399015331 is an apocalyptic number.

399015331 is a deficient number, since it is larger than the sum of its proper divisors (76209293).

399015331 is a wasteful number, since it uses less digits than its factorization.

399015331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451 (or 324 counting only the distinct ones).

The product of its (nonzero) digits is 10935, while the sum is 34.

The square root of 399015331 is about 19975.3681067459. The cubic root of 399015331 is about 736.2012110108.

It can be divided in two parts, 3990 and 15331, that added together give a square (19321 = 139²).

The spelling of 399015331 in words is "three hundred ninety-nine million, fifteen thousand, three hundred thirty-one".