998939898 has 32 divisors (see below), whose sum is σ = 2421673920. Its totient is φ = 302708880.

The previous prime is 998939881. The next prime is 998939899. The reversal of 998939898 is 898939899.

It is not an unprimeable number, because it can be changed into a prime (998939899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 840265 + ... + 841452.

It is an arithmetic number, because the mean of its divisors is an integer number (75677310).

Almost surely, 2^998939898 is an apocalyptic number.

998939898 is an abundant number, since it is smaller than the sum of its proper divisors (1422734022).

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

998939898 is a wasteful number, since it uses less digits than its factorization.

998939898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1681739 (or 1681733 counting only the distinct ones).

The product of its digits is 90699264, while the sum is 72.

The square root of 998939898 is about 31606.0104726933. The cubic root of 998939898 is about 999.6465077246.

Subtracting from 998939898 its reverse (898939899), we obtain a palindrome (99999999).

The spelling of 998939898 in words is "nine hundred ninety-eight million, nine hundred thirty-nine thousand, eight hundred ninety-eight".