399880836 has 72 divisors (see below), whose sum is σ = 1027353600. Its totient is φ = 131132736.

The previous prime is 399880823. The next prime is 399880837. The reversal of 399880836 is 638088993.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (399880837) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 680935 + ... + 681521.

It is an arithmetic number, because the mean of its divisors is an integer number (14268800).

Almost surely, 2^399880836 is an apocalyptic number.

399880836 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

399880836 is an abundant number, since it is smaller than the sum of its proper divisors (627472764).

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

399880836 is a wasteful number, since it uses less digits than its factorization.

399880836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 873 (or 868 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 54.

The square root of 399880836 is about 19997.0206780910. The cubic root of 399880836 is about 736.7331251395.

The spelling of 399880836 in words is "three hundred ninety-nine million, eight hundred eighty thousand, eight hundred thirty-six".