398400874956 has 72 divisors (see below), whose sum is σ = 1200976568064. Its totient is φ = 108879740640.

The previous prime is 398400874931. The next prime is 398400874997. The reversal of 398400874956 is 659478004893.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 398400874893 and 398400874902.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 34362810 + ... + 34374401.

It is an arithmetic number, because the mean of its divisors is an integer number (16680230112).

Almost surely, 2^398400874956 is an apocalyptic number.

398400874956 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

398400874956 is an abundant number, since it is smaller than the sum of its proper divisors (802575693108).

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

398400874956 is a wasteful number, since it uses less digits than its factorization.

398400874956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68737251 (or 68737246 counting only the distinct ones).

The product of its (nonzero) digits is 52254720, while the sum is 63.

The spelling of 398400874956 in words is "three hundred ninety-eight billion, four hundred million, eight hundred seventy-four thousand, nine hundred fifty-six".