998171898 has 24 divisors (see below), whose sum is σ = 2120687232. Its totient is φ = 313151424.

The previous prime is 998171869. The next prime is 998171899. The reversal of 998171898 is 898171899.

It is not an unprimeable number, because it can be changed into a prime (998171899) 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, 286090 + ... + 289557.

It is an arithmetic number, because the mean of its divisors is an integer number (88361968).

Almost surely, 2^998171898 is an apocalyptic number.

998171898 is an abundant number, since it is smaller than the sum of its proper divisors (1122515334).

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

998171898 is a wasteful number, since it uses less digits than its factorization.

998171898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 575686 (or 575669 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 60.

The square root of 998171898 is about 31593.8585487750. The cubic root of 998171898 is about 999.3902609605.

Subtracting from 998171898 its reverse (898171899), we obtain a palindrome (99999999).

The spelling of 998171898 in words is "nine hundred ninety-eight million, one hundred seventy-one thousand, eight hundred ninety-eight".