399999945504 has 24 divisors (see below), whose sum is σ = 1049999857200. Its totient is φ = 133333315136.

The previous prime is 399999945497. The next prime is 399999945511. The reversal of 399999945504 is 405549999993.

It is an interprime number because it is at equal distance from previous prime (399999945497) and next prime (399999945511).

It is a tau number, because it is divible by the number of its divisors (24).

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, 2083332954 + ... + 2083333145.

It is an arithmetic number, because the mean of its divisors is an integer number (43749994050).

Almost surely, 2^399999945504 is an apocalyptic number.

It is an amenable number.

399999945504 is an abundant number, since it is smaller than the sum of its proper divisors (649999911696).

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

399999945504 is a wasteful number, since it uses less digits than its factorization.

399999945504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4166666112 (or 4166666104 counting only the distinct ones).

The product of its (nonzero) digits is 637729200, while the sum is 75.

The spelling of 399999945504 in words is "three hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred forty-five thousand, five hundred four".