9975979 has 8 divisors (see below), whose sum is σ = 10840032. Its totient is φ = 9125760.

The previous prime is 9975943. The next prime is 9975989. The reversal of 9975979 is 9795799.

9975979 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9975979 - 2⁷ = 9975851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9975989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1927 + ... + 4864.

It is an arithmetic number, because the mean of its divisors is an integer number (1355004).

Almost surely, 2^9975979 is an apocalyptic number.

9975979 is a deficient number, since it is larger than the sum of its proper divisors (864053).

9975979 is a wasteful number, since it uses less digits than its factorization.

9975979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6917.

The product of its digits is 1607445, while the sum is 55.

The square root of 9975979 is about 3158.4773230150. The cubic root of 9975979 is about 215.2708251077.

The spelling of 9975979 in words is "nine million, nine hundred seventy-five thousand, nine hundred seventy-nine".