9717979 has 8 divisors (see below), whose sum is σ = 9910080. Its totient is φ = 9527616.

The previous prime is 9717977. The next prime is 9717989. The reversal of 9717979 is 9797179.

It is a happy number.

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 9717979 - 2¹ = 9717977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9717977) 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, 17169 + ... + 17725.

It is an arithmetic number, because the mean of its divisors is an integer number (1238760).

Almost surely, 2^9717979 is an apocalyptic number.

9717979 is a deficient number, since it is larger than the sum of its proper divisors (192101).

9717979 is a wasteful number, since it uses less digits than its factorization.

9717979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869.

The product of its digits is 250047, while the sum is 49.

The square root of 9717979 is about 3117.3673187483. The cubic root of 9717979 is about 213.3988061302.

The spelling of 9717979 in words is "nine million, seven hundred seventeen thousand, nine hundred seventy-nine".