981898638 has 32 divisors (see below), whose sum is σ = 2246599680. Its totient is φ = 280260000.

The previous prime is 981898607. The next prime is 981898657. The reversal of 981898638 is 836898189.

It is a happy number.

981898638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 32388 + ... + 54888.

It is an arithmetic number, because the mean of its divisors is an integer number (70206240).

Almost surely, 2^981898638 is an apocalyptic number.

981898638 is an abundant number, since it is smaller than the sum of its proper divisors (1264701042).

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

981898638 is a wasteful number, since it uses less digits than its factorization.

981898638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23552.

The product of its digits is 5971968, while the sum is 60.

The square root of 981898638 is about 31335.2618945494. The cubic root of 981898638 is about 993.9294354834.

The spelling of 981898638 in words is "nine hundred eighty-one million, eight hundred ninety-eight thousand, six hundred thirty-eight".