398878097442 has 24 divisors (see below), whose sum is σ = 876872513328. Its totient is φ = 120872150520.

The previous prime is 398878097441. The next prime is 398878097447. The reversal of 398878097442 is 244790878893.

It is not an unprimeable number, because it can be changed into a prime (398878097441) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 274708708 + ... + 274710159.

It is an arithmetic number, because the mean of its divisors is an integer number (36536354722).

Almost surely, 2^398878097442 is an apocalyptic number.

398878097442 is an abundant number, since it is smaller than the sum of its proper divisors (477994415886).

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

398878097442 is a wasteful number, since it uses less digits than its factorization.

398878097442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549418894 (or 549418883 counting only the distinct ones).

The product of its (nonzero) digits is 195084288, while the sum is 69.

The spelling of 398878097442 in words is "three hundred ninety-eight billion, eight hundred seventy-eight million, ninety-seven thousand, four hundred forty-two".