9799999979 has 16 divisors (see below), whose sum is σ = 12936900096. Its totient is φ = 7187164800.

The previous prime is 9799999943. The next prime is 9799999997.

9799999979 is nontrivially palindromic in base 10.

It is a de Polignac number, because none of the positive numbers 2^k-9799999979 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9799999979.

It is not an unprimeable number, because it can be changed into a prime (9799999679) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3742007 + ... + 3744624.

It is an arithmetic number, because the mean of its divisors is an integer number (808556256).

Almost surely, 2^9799999979 is an apocalyptic number.

9799999979 is a deficient number, since it is larger than the sum of its proper divisors (3136900117).

9799999979 is a wasteful number, since it uses less digits than its factorization.

9799999979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7486666.

The product of its digits is 2109289329, while the sum is 86.

The square root of 9799999979 is about 98994.9492600506. The cubic root of 9799999979 is about 2139.9749596016.

The spelling of 9799999979 in words is "nine billion, seven hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred seventy-nine".