399799728 has 60 divisors (see below), whose sum is σ = 1121378128. Its totient is φ = 132969600.

The previous prime is 399799711. The next prime is 399799781. The reversal of 399799728 is 827997993.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 67278 + ... + 72978.

Almost surely, 2^399799728 is an apocalyptic number.

It is an amenable number.

399799728 is an abundant number, since it is smaller than the sum of its proper divisors (721578400).

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

399799728 is a wasteful number, since it uses less digits than its factorization.

399799728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6202 (or 6193 counting only the distinct ones).

The product of its digits is 15431472, while the sum is 63.

The square root of 399799728 is about 19994.9925731419. The cubic root of 399799728 is about 736.6833111404.

The spelling of 399799728 in words is "three hundred ninety-nine million, seven hundred ninety-nine thousand, seven hundred twenty-eight".