399364313840 has 40 divisors (see below), whose sum is σ = 935202070320. Its totient is φ = 158596471296.

The previous prime is 399364313839. The next prime is 399364313897. The reversal of 399364313840 is 48313463993.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17945909 + ... + 17968148.

It is an arithmetic number, because the mean of its divisors is an integer number (23380051758).

Almost surely, 2^399364313840 is an apocalyptic number.

It is an amenable number.

399364313840 is an abundant number, since it is smaller than the sum of its proper divisors (535837756480).

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

399364313840 is a wasteful number, since it uses less digits than its factorization.

399364313840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35914209 (or 35914203 counting only the distinct ones).

The product of its (nonzero) digits is 5038848, while the sum is 53.

The spelling of 399364313840 in words is "three hundred ninety-nine billion, three hundred sixty-four million, three hundred thirteen thousand, eight hundred forty".