399379984 has 20 divisors (see below), whose sum is σ = 776328784. Its totient is φ = 199037088.

The previous prime is 399379973. The next prime is 399379991. The reversal of 399379984 is 489973993.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35742 + ... + 45565.

Almost surely, 2^399379984 is an apocalyptic number.

It is an amenable number.

399379984 is a deficient number, since it is larger than the sum of its proper divisors (376948800).

399379984 is a wasteful number, since it uses less digits than its factorization.

399379984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81622 (or 81616 counting only the distinct ones).

The product of its digits is 13226976, while the sum is 61.

The square root of 399379984 is about 19984.4935887803. The cubic root of 399379984 is about 736.4254097831.

The spelling of 399379984 in words is "three hundred ninety-nine million, three hundred seventy-nine thousand, nine hundred eighty-four".