399401045504 has 40 divisors (see below), whose sum is σ = 832718644560. Its totient is φ = 191017885696.

The previous prime is 399401045489. The next prime is 399401045507. The reversal of 399401045504 is 405540104993.

It is a super-2 number, since 2×399401045504² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399401045507) 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, 16946489 + ... + 16970040.

It is an arithmetic number, because the mean of its divisors is an integer number (20817966114).

Almost surely, 2^399401045504 is an apocalyptic number.

It is an amenable number.

399401045504 is an abundant number, since it is smaller than the sum of its proper divisors (433317599056).

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

399401045504 is an equidigital number, since it uses as much as digits as its factorization.

399401045504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33916570 (or 33916554 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 44.

The spelling of 399401045504 in words is "three hundred ninety-nine billion, four hundred one million, forty-five thousand, five hundred four".