9720979 has 4 divisors (see below), whose sum is σ = 9759960. Its totient is φ = 9682000.

The previous prime is 9720959. The next prime is 9721013. The reversal of 9720979 is 9790279.

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 9720979 - 2¹¹ = 9718931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9720959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19114 + ... + 19615.

It is an arithmetic number, because the mean of its divisors is an integer number (2439990).

Almost surely, 2^9720979 is an apocalyptic number.

9720979 is a deficient number, since it is larger than the sum of its proper divisors (38981).

9720979 is a wasteful number, since it uses less digits than its factorization.

9720979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38980.

The product of its (nonzero) digits is 71442, while the sum is 43.

The square root of 9720979 is about 3117.8484568689. The cubic root of 9720979 is about 213.4207630464.

The spelling of 9720979 in words is "nine million, seven hundred twenty thousand, nine hundred seventy-nine".