998979898 has 16 divisors (see below), whose sum is σ = 1767780864. Its totient is φ = 414323280.

The previous prime is 998979833. The next prime is 998979899. The reversal of 998979898 is 898979899.

It is not an unprimeable number, because it can be changed into a prime (998979899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1150465 + ... + 1151332.

It is an arithmetic number, because the mean of its divisors is an integer number (110486304).

Almost surely, 2^998979898 is an apocalyptic number.

998979898 is a deficient number, since it is larger than the sum of its proper divisors (768800966).

998979898 is a wasteful number, since it uses less digits than its factorization.

998979898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2301837.

The product of its digits is 211631616, while the sum is 76.

The square root of 998979898 is about 31606.6432573913. The cubic root of 998979898 is about 999.6598503113.

Subtracting from 998979898 its reverse (898979899), we obtain a palindrome (99999999).

The spelling of 998979898 in words is "nine hundred ninety-eight million, nine hundred seventy-nine thousand, eight hundred ninety-eight".