9979998 has 16 divisors (see below), whose sum is σ = 22811520. Its totient is φ = 2851416.

The previous prime is 9979993. The next prime is 9980017. The reversal of 9979998 is 8999799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9979993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118768 + ... + 118851.

It is an arithmetic number, because the mean of its divisors is an integer number (1425720).

Almost surely, 2^9979998 is an apocalyptic number.

9979998 is an abundant number, since it is smaller than the sum of its proper divisors (12831522).

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

9979998 is a wasteful number, since it uses less digits than its factorization.

9979998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237631.

The product of its digits is 3306744, while the sum is 60.

The square root of 9979998 is about 3159.1134832418. The cubic root of 9979998 is about 215.2997297826.

The spelling of 9979998 in words is "nine million, nine hundred seventy-nine thousand, nine hundred ninety-eight".