399939344 has 20 divisors (see below), whose sum is σ = 885580224. Its totient is φ = 171402528.

The previous prime is 399939329. The next prime is 399939359. The reversal of 399939344 is 443939993.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (399939329) and next prime (399939359).

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1785332 + ... + 1785555.

Almost surely, 2^399939344 is an apocalyptic number.

It is an amenable number.

399939344 is an abundant number, since it is smaller than the sum of its proper divisors (485640880).

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

399939344 is a wasteful number, since it uses less digits than its factorization.

399939344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3570902 (or 3570896 counting only the distinct ones).

The product of its digits is 2834352, while the sum is 53.

The square root of 399939344 is about 19998.4835425089. The cubic root of 399939344 is about 736.7690547430.

The spelling of 399939344 in words is "three hundred ninety-nine million, nine hundred thirty-nine thousand, three hundred forty-four".