399481428816 has 30 divisors (see below), whose sum is σ = 1117993165770. Its totient is φ = 133160476224.

The previous prime is 399481428781. The next prime is 399481428847. The reversal of 399481428816 is 618824184993.

399481428816 is a `hidden beast` number, since 3 + 99 + 48 + 1 + 428 + 81 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 381553290000 + 17928138816 = 617700^2 + 133896^2 .

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1387088151 + ... + 1387088438.

It is an arithmetic number, because the mean of its divisors is an integer number (37266438859).

Almost surely, 2^399481428816 is an apocalyptic number.

399481428816 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

399481428816 is an abundant number, since it is smaller than the sum of its proper divisors (718511736954).

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

399481428816 is a wasteful number, since it uses less digits than its factorization.

399481428816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2774176603 (or 2774176594 counting only the distinct ones).

The product of its digits is 23887872, while the sum is 63.

The spelling of 399481428816 in words is "three hundred ninety-nine billion, four hundred eighty-one million, four hundred twenty-eight thousand, eight hundred sixteen".