398889679992 has 64 divisors (see below), whose sum is σ = 1036798694400. Its totient is φ = 127748344320.

The previous prime is 398889679973. The next prime is 398889680027. The reversal of 398889679992 is 299976988893.

It is a super-2 number, since 2×398889679992² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 398889679899 and 398889679908.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1825153 + ... + 2031984.

It is an arithmetic number, because the mean of its divisors is an integer number (16199979600).

Almost surely, 2^398889679992 is an apocalyptic number.

It is an amenable number.

398889679992 is an abundant number, since it is smaller than the sum of its proper divisors (637909014408).

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

398889679992 is a wasteful number, since it uses less digits than its factorization.

398889679992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3857316 (or 3857312 counting only the distinct ones).

The product of its digits is 7618738176, while the sum is 87.

The spelling of 398889679992 in words is "three hundred ninety-eight billion, eight hundred eighty-nine million, six hundred seventy-nine thousand, nine hundred ninety-two".