399818161836 has 48 divisors (see below), whose sum is σ = 1051165140480. Its totient is φ = 131395637520.

The previous prime is 399818161823. The next prime is 399818161861. The reversal of 399818161836 is 638161818993.

399818161836 is a `hidden beast` number, since 3 + 9 + 9 + 8 + 1 + 8 + 1 + 618 + 3 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26062896 + ... + 26078231.

It is an arithmetic number, because the mean of its divisors is an integer number (21899273760).

Almost surely, 2^399818161836 is an apocalyptic number.

399818161836 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

399818161836 is an abundant number, since it is smaller than the sum of its proper divisors (651346978644).

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

399818161836 is a wasteful number, since it uses less digits than its factorization.

399818161836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52141211 (or 52141203 counting only the distinct ones).

The product of its digits is 13436928, while the sum is 63.

The spelling of 399818161836 in words is "three hundred ninety-nine billion, eight hundred eighteen million, one hundred sixty-one thousand, eight hundred thirty-six".