399816360564 has 12 divisors (see below), whose sum is σ = 932904841344. Its totient is φ = 133272120184.

The previous prime is 399816360563. The next prime is 399816360569. The reversal of 399816360564 is 465063618993.

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

It is a junction number, because it is equal to n+sod(n) for n = 399816360498 and 399816360507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399816360563) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 16659015012 + ... + 16659015035.

It is an arithmetic number, because the mean of its divisors is an integer number (77742070112).

Almost surely, 2^399816360564 is an apocalyptic number.

It is an amenable number.

399816360564 is an abundant number, since it is smaller than the sum of its proper divisors (533088480780).

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

399816360564 is a wasteful number, since it uses less digits than its factorization.

399816360564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33318030054 (or 33318030052 counting only the distinct ones).

The product of its (nonzero) digits is 25194240, while the sum is 60.

The spelling of 399816360564 in words is "three hundred ninety-nine billion, eight hundred sixteen million, three hundred sixty thousand, five hundred sixty-four".