398888475984 has 120 divisors (see below), whose sum is σ = 1137352725600. Its totient is φ = 130469771520.

The previous prime is 398888475971. The next prime is 398888475989. The reversal of 398888475984 is 489574888893.

398888475984 is a `hidden beast` number, since 398 + 8 + 8 + 84 + 75 + 9 + 84 = 666.

It is a super-2 number, since 2×398888475984² (a number of 24 digits) contains 22 as substring.

Its product of digits (4459069440) is a multiple of the sum of its prime divisors (108864).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398888475989) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3626307 + ... + 3734685.

It is an arithmetic number, because the mean of its divisors is an integer number (9477939380).

Almost surely, 2^398888475984 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 398888475984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (568676362800).

398888475984 is an abundant number, since it is smaller than the sum of its proper divisors (738464249616).

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

398888475984 is a wasteful number, since it uses less digits than its factorization.

398888475984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108873 (or 108864 counting only the distinct ones).

The product of its digits is 4459069440, while the sum is 81.

The spelling of 398888475984 in words is "three hundred ninety-eight billion, eight hundred eighty-eight million, four hundred seventy-five thousand, nine hundred eighty-four".