399013720 has 32 divisors (see below), whose sum is σ = 1026036000. Its totient is φ = 136804608.

The previous prime is 399013709. The next prime is 399013739. The reversal of 399013720 is 27310993.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 712245 + ... + 712804.

It is an arithmetic number, because the mean of its divisors is an integer number (32063625).

Almost surely, 2^399013720 is an apocalyptic number.

It is an amenable number.

399013720 is an abundant number, since it is smaller than the sum of its proper divisors (627022280).

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

399013720 is a wasteful number, since it uses less digits than its factorization.

399013720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1425067 (or 1425063 counting only the distinct ones).

The product of its (nonzero) digits is 10206, while the sum is 34.

The square root of 399013720 is about 19975.3277820415. The cubic root of 399013720 is about 736.2002202203.

The spelling of 399013720 in words is "three hundred ninety-nine million, thirteen thousand, seven hundred twenty".