399031842 has 16 divisors (see below), whose sum is σ = 870615072. Its totient is φ = 120918720.

The previous prime is 399031811. The next prime is 399031847. The reversal of 399031842 is 248130993.

It is a self number, because there is not a number n which added to its sum of digits gives 399031842.

It is not an unprimeable number, because it can be changed into a prime (399031847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3022903 + ... + 3023034.

It is an arithmetic number, because the mean of its divisors is an integer number (54413442).

Almost surely, 2^399031842 is an apocalyptic number.

399031842 is an abundant number, since it is smaller than the sum of its proper divisors (471583230).

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

399031842 is a wasteful number, since it uses less digits than its factorization.

399031842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6045953.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 399031842 is about 19975.7813864690. The cubic root of 399031842 is about 736.2113653829.

The spelling of 399031842 in words is "three hundred ninety-nine million, thirty-one thousand, eight hundred forty-two".