9998077979 has 4 divisors (see below), whose sum is σ = 9999198000. Its totient is φ = 9996957960.

The previous prime is 9998077949. The next prime is 9998077997. The reversal of 9998077979 is 9797708999.

9998077979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9998077979 - 2²⁸ = 9729642523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9998077909) 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 3 ways as a sum of consecutive naturals, for example, 546512 + ... + 564509.

It is an arithmetic number, because the mean of its divisors is an integer number (2499799500).

Almost surely, 2^9998077979 is an apocalyptic number.

9998077979 is a deficient number, since it is larger than the sum of its proper divisors (1120021).

9998077979 is a wasteful number, since it uses less digits than its factorization.

9998077979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1120020.

The product of its (nonzero) digits is 162030456, while the sum is 74.

The square root of 9998077979 is about 99990.3894331850. The cubic root of 9998077979 is about 2154.2966522305.

The spelling of 9998077979 in words is "nine billion, nine hundred ninety-eight million, seventy-seven thousand, nine hundred seventy-nine".