399416872 has 16 divisors (see below), whose sum is σ = 759166740. Its totient is φ = 196972416.

The previous prime is 399416869. The next prime is 399416891. The reversal of 399416872 is 278614993.

It can be written as a sum of positive squares in 2 ways, for example, as 331749796 + 67667076 = 18214^2 + 8226^2 .

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, 341383 + ... + 342550.

Almost surely, 2^399416872 is an apocalyptic number.

It is an amenable number.

399416872 is a deficient number, since it is larger than the sum of its proper divisors (359749868).

399416872 is a wasteful number, since it uses less digits than its factorization.

399416872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684012 (or 684008 counting only the distinct ones).

The product of its digits is 653184, while the sum is 49.

The square root of 399416872 is about 19985.4164830258. The cubic root of 399416872 is about 736.4480819460.

The spelling of 399416872 in words is "three hundred ninety-nine million, four hundred sixteen thousand, eight hundred seventy-two".