9919998 has 24 divisors (see below), whose sum is σ = 23447736. Its totient is φ = 3006000.

The previous prime is 9919997. The next prime is 9920021. The reversal of 9919998 is 8999199.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9919997) 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 11 ways as a sum of consecutive naturals, for example, 24853 + ... + 25248.

It is an arithmetic number, because the mean of its divisors is an integer number (976989).

Almost surely, 2^9919998 is an apocalyptic number.

9919998 is an abundant number, since it is smaller than the sum of its proper divisors (13527738).

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

9919998 is a wasteful number, since it uses less digits than its factorization.

9919998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50120 (or 50117 counting only the distinct ones).

The product of its digits is 472392, while the sum is 54.

The square root of 9919998 is about 3149.6028321044. The cubic root of 9919998 is about 214.8673997578.

The spelling of 9919998 in words is "nine million, nine hundred nineteen thousand, nine hundred ninety-eight".