399709737564 has 12 divisors (see below), whose sum is σ = 932656054344. Its totient is φ = 133236579184.

The previous prime is 399709737563. The next prime is 399709737569. The reversal of 399709737564 is 465737907993.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399709737563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16654572387 + ... + 16654572410.

It is an arithmetic number, because the mean of its divisors is an integer number (77721337862).

Almost surely, 2^399709737564 is an apocalyptic number.

It is an amenable number.

399709737564 is an abundant number, since it is smaller than the sum of its proper divisors (532946316780).

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

399709737564 is a wasteful number, since it uses less digits than its factorization.

399709737564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33309144804 (or 33309144802 counting only the distinct ones).

The product of its (nonzero) digits is 270050760, while the sum is 69.

The spelling of 399709737564 in words is "three hundred ninety-nine billion, seven hundred nine million, seven hundred thirty-seven thousand, five hundred sixty-four".