9978839579 has 4 divisors (see below), whose sum is σ = 10248537984. Its totient is φ = 9709141176.

The previous prime is 9978839573. The next prime is 9978839597. The reversal of 9978839579 is 9759388799.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9978839579 - 2⁸ = 9978839323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9978839573) 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 3 ways as a sum of consecutive naturals, for example, 134849147 + ... + 134849220.

It is an arithmetic number, because the mean of its divisors is an integer number (2562134496).

Almost surely, 2^9978839579 is an apocalyptic number.

9978839579 is a deficient number, since it is larger than the sum of its proper divisors (269698405).

9978839579 is a wasteful number, since it uses less digits than its factorization.

9978839579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269698404.

The product of its digits is 308629440, while the sum is 74.

The square root of 9978839579 is about 99894.1418652766. The cubic root of 9978839579 is about 2152.9139920714.

The spelling of 9978839579 in words is "nine billion, nine hundred seventy-eight million, eight hundred thirty-nine thousand, five hundred seventy-nine".