399371216 has 10 divisors (see below), whose sum is σ = 773781762. Its totient is φ = 199685600.

The previous prime is 399371207. The next prime is 399371239. The reversal of 399371216 is 612173993.

It can be written as a sum of positive squares in only one way, i.e., 384316816 + 15054400 = 19604^2 + 3880^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12480335 + ... + 12480366.

Almost surely, 2^399371216 is an apocalyptic number.

It is an amenable number.

399371216 is a deficient number, since it is larger than the sum of its proper divisors (374410546).

399371216 is a wasteful number, since it uses less digits than its factorization.

399371216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24960709 (or 24960703 counting only the distinct ones).

The product of its digits is 61236, while the sum is 41.

The square root of 399371216 is about 19984.2742174941. The cubic root of 399371216 is about 736.4200205752.

The spelling of 399371216 in words is "three hundred ninety-nine million, three hundred seventy-one thousand, two hundred sixteen".