9121998 has 16 divisors (see below), whose sum is σ = 18832896. Its totient is φ = 2942520.

The previous prime is 9121993. The next prime is 9121999. The reversal of 9121998 is 8991219.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9121993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24336 + ... + 24707.

It is an arithmetic number, because the mean of its divisors is an integer number (1177056).

Almost surely, 2^9121998 is an apocalyptic number.

9121998 is an abundant number, since it is smaller than the sum of its proper divisors (9710898).

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

9121998 is a wasteful number, since it uses less digits than its factorization.

9121998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49079.

The product of its digits is 11664, while the sum is 39.

The square root of 9121998 is about 3020.2645579485. The cubic root of 9121998 is about 208.9440415499.

The spelling of 9121998 in words is "nine million, one hundred twenty-one thousand, nine hundred ninety-eight".