9900979 has 4 divisors (see below), whose sum is σ = 10801080. Its totient is φ = 9000880.

The previous prime is 9900959. The next prime is 9901007. The reversal of 9900979 is 9790099.

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 9900979 - 2⁹ = 9900467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9900949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 450034 + ... + 450055.

It is an arithmetic number, because the mean of its divisors is an integer number (2700270).

Almost surely, 2^9900979 is an apocalyptic number.

9900979 is a deficient number, since it is larger than the sum of its proper divisors (900101).

9900979 is a wasteful number, since it uses less digits than its factorization.

9900979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 900100.

The product of its (nonzero) digits is 45927, while the sum is 43.

The square root of 9900979 is about 3146.5821139770. The cubic root of 9900979 is about 214.7299945722.

The spelling of 9900979 in words is "nine million, nine hundred thousand, nine hundred seventy-nine".