9998918 has 16 divisors (see below), whose sum is σ = 15283296. Its totient is φ = 4905600.

The previous prime is 9998903. The next prime is 9998929. The reversal of 9998918 is 8198999.

It is a super-2 number, since 2×9998918² = 199956722341448, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 9998918.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33980 + ... + 34272.

It is an arithmetic number, because the mean of its divisors is an integer number (955206).

Almost surely, 2^9998918 is an apocalyptic number.

9998918 is a deficient number, since it is larger than the sum of its proper divisors (5284378).

9998918 is a wasteful number, since it uses less digits than its factorization.

9998918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559.

The product of its digits is 419904, while the sum is 53.

The square root of 9998918 is about 3162.1065763190. The cubic root of 9998918 is about 215.4356983951.

The spelling of 9998918 in words is "nine million, nine hundred ninety-eight thousand, nine hundred eighteen".