399042836 has 12 divisors (see below), whose sum is σ = 739403028. Its totient is φ = 187784832.

The previous prime is 399042823. The next prime is 399042851. The reversal of 399042836 is 638240993.

It can be written as a sum of positive squares in 2 ways, for example, as 113635600 + 285407236 = 10660^2 + 16894^2 .

It is a congruent number.

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, 2934071 + ... + 2934206.

It is an arithmetic number, because the mean of its divisors is an integer number (61616919).

Almost surely, 2^399042836 is an apocalyptic number.

It is an amenable number.

399042836 is a deficient number, since it is larger than the sum of its proper divisors (340360192).

399042836 is a wasteful number, since it uses less digits than its factorization.

399042836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5868298 (or 5868296 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 44.

The square root of 399042836 is about 19976.0565678014. The cubic root of 399042836 is about 736.2181266090.

The spelling of 399042836 in words is "three hundred ninety-nine million, forty-two thousand, eight hundred thirty-six".