399504756 has 48 divisors (see below), whose sum is σ = 1111670784. Its totient is φ = 109180896.

The previous prime is 399504751. The next prime is 399504757. The reversal of 399504756 is 657405993.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399504751) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101460 + ... + 105323.

It is an arithmetic number, because the mean of its divisors is an integer number (23159808).

Almost surely, 2^399504756 is an apocalyptic number.

It is an amenable number.

399504756 is an abundant number, since it is smaller than the sum of its proper divisors (712166028).

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

399504756 is a wasteful number, since it uses less digits than its factorization.

399504756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206820 (or 206818 counting only the distinct ones).

The product of its (nonzero) digits is 1020600, while the sum is 48.

The square root of 399504756 is about 19987.6150653348. The cubic root of 399504756 is about 736.5020917299.

The spelling of 399504756 in words is "three hundred ninety-nine million, five hundred four thousand, seven hundred fifty-six".