399743864704428 has 12 divisors (see below), whose sum is σ = 932735684310360. Its totient is φ = 133247954901472.

The previous prime is 399743864704409. The next prime is 399743864704439. The reversal of 399743864704428 is 824407468347993.

It is a tau number, because it is divible by the number of its divisors (12).

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, 16655994362673 + ... + 16655994362696.

It is an arithmetic number, because the mean of its divisors is an integer number (77727973692530).

Almost surely, 2^{399743864704428} is an apocalyptic number.

It is an amenable number.

399743864704428 is an abundant number, since it is smaller than the sum of its proper divisors (532991819605932).

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

399743864704428 is a wasteful number, since it uses less digits than its factorization.

399743864704428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33311988725376 (or 33311988725374 counting only the distinct ones).

The product of its (nonzero) digits is 7023034368, while the sum is 78.

The spelling of 399743864704428 in words is "three hundred ninety-nine trillion, seven hundred forty-three billion, eight hundred sixty-four million, seven hundred four thousand, four hundred twenty-eight".