9917979 has 8 divisors (see below), whose sum is σ = 13266960. Its totient is φ = 6590496.

The previous prime is 9917969. The next prime is 9917983. The reversal of 9917979 is 9797199.

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

It is not a de Polignac number, because 9917979 - 2¹³ = 9909787 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9917909) 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 7 ways as a sum of consecutive naturals, for example, 4264 + ... + 6165.

It is an arithmetic number, because the mean of its divisors is an integer number (1658370).

Almost surely, 2^9917979 is an apocalyptic number.

9917979 is a deficient number, since it is larger than the sum of its proper divisors (3348981).

9917979 is a wasteful number, since it uses less digits than its factorization.

9917979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10749.

The product of its digits is 321489, while the sum is 51.

The square root of 9917979 is about 3149.2822991914. The cubic root of 9917979 is about 214.8528215722.

The spelling of 9917979 in words is "nine million, nine hundred seventeen thousand, nine hundred seventy-nine".