9998998 has 16 divisors (see below), whose sum is σ = 15624000.
Its totient is φ = 4795200.
The previous prime is 9998977. The next prime is 9999047. The reversal of 9998998 is 8998999.
Subtracting from 9998998 its reverse (8998999), we obtain a palindrome (999999).
It is a super-2 number, since 2×99989982 = 199959922008008, which contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (61).
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, 4003 + ... + 6001.
It is an arithmetic number, because the mean of its divisors is an integer number (976500).
Almost surely, 29998998 is an apocalyptic number.
9998998 is a deficient number, since it is larger than the sum of its proper divisors (5625002).
9998998 is a wasteful number, since it uses less digits than its factorization.
9998998 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 2103.
The product of its digits is 3779136, while the sum is 61.
The square root of 9998998 is about 3162.1192260887.
The cubic root of 9998998 is about 215.4362729510.
The spelling of 9998998 in words is "nine million, nine hundred ninety-eight thousand, nine hundred ninety-eight".