398887895970 has 96 divisors (see below), whose sum is σ = 1059398376192. Its totient is φ = 104084925696.

The previous prime is 398887895951. The next prime is 398887895983. The reversal of 398887895970 is 79598788893.

398887895970 is a `hidden beast` number, since 398 + 8 + 8 + 78 + 95 + 9 + 70 = 666.

398887895970 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×398887895970² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 398887895970.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 32789109 + ... + 32801271.

It is an arithmetic number, because the mean of its divisors is an integer number (11035399752).

Almost surely, 2^398887895970 is an apocalyptic number.

398887895970 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 398887895970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (529699188096).

398887895970 is an abundant number, since it is smaller than the sum of its proper divisors (660510480222).

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

398887895970 is a wasteful number, since it uses less digits than its factorization.

398887895970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19976 (or 19973 counting only the distinct ones).

The product of its (nonzero) digits is 2194698240, while the sum is 81.

The spelling of 398887895970 in words is "three hundred ninety-eight billion, eight hundred eighty-seven million, eight hundred ninety-five thousand, nine hundred seventy".