399681836 has 12 divisors (see below), whose sum is σ = 699786360. Its totient is φ = 199742880.

The previous prime is 399681811. The next prime is 399681839. The reversal of 399681836 is 638186993.

It is not an unprimeable number, because it can be changed into a prime (399681839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14921 + ... + 31968.

It is an arithmetic number, because the mean of its divisors is an integer number (58315530).

Almost surely, 2^399681836 is an apocalyptic number.

It is an amenable number.

399681836 is a deficient number, since it is larger than the sum of its proper divisors (300104524).

399681836 is a wasteful number, since it uses less digits than its factorization.

399681836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49024 (or 49022 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 53.

The square root of 399681836 is about 19992.0443176780. The cubic root of 399681836 is about 736.6108935433.

The spelling of 399681836 in words is "three hundred ninety-nine million, six hundred eighty-one thousand, eight hundred thirty-six".