9913979 has 2 divisors, whose sum is σ = 9913980. Its totient is φ = 9913978.

The previous prime is 9913973. The next prime is 9913987. The reversal of 9913979 is 9793199.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9913979 - 2⁸ = 9913723 is a prime.

It is a super-2 number, since 2×9913979² = 196573959224882, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (9913973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4956989 + 4956990.

It is an arithmetic number, because the mean of its divisors is an integer number (4956990).

Almost surely, 2^9913979 is an apocalyptic number.

9913979 is a deficient number, since it is larger than the sum of its proper divisors (1).

9913979 is an equidigital number, since it uses as much as digits as its factorization.

9913979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 137781, while the sum is 47.

The square root of 9913979 is about 3148.6471698175. The cubic root of 9913979 is about 214.8239337364.

The spelling of 9913979 in words is "nine million, nine hundred thirteen thousand, nine hundred seventy-nine".