399393942 has 32 divisors (see below), whose sum is σ = 835246080. Its totient is φ = 127319720.

The previous prime is 399393931. The next prime is 399393959. The reversal of 399393942 is 249393993.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70267 + ... + 75737.

It is an arithmetic number, because the mean of its divisors is an integer number (26101440).

Almost surely, 2^399393942 is an apocalyptic number.

399393942 is an abundant number, since it is smaller than the sum of its proper divisors (435852138).

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

399393942 is an equidigital number, since it uses as much as digits as its factorization.

399393942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5545 (or 5499 counting only the distinct ones).

The product of its digits is 1417176, while the sum is 51.

The square root of 399393942 is about 19984.8428064871. The cubic root of 399393942 is about 736.4339888361.

Adding to 399393942 its sum of digits (51), we get a palindrome (399393993).

The spelling of 399393942 in words is "three hundred ninety-nine million, three hundred ninety-three thousand, nine hundred forty-two".