9719999979 has 8 divisors (see below), whose sum is σ = 13025126400. Its totient is φ = 6447436776.

The previous prime is 9719999959. The next prime is 9720000007. The reversal of 9719999979 is 9799999179.

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

It is not a de Polignac number, because 9719999979 - 2¹⁹ = 9719475691 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9719999959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8140107 + ... + 8141300.

It is an arithmetic number, because the mean of its divisors is an integer number (1628140800).

Almost surely, 2^9719999979 is an apocalyptic number.

9719999979 is a deficient number, since it is larger than the sum of its proper divisors (3305126421).

9719999979 is a wasteful number, since it uses less digits than its factorization.

9719999979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16281609.

The product of its digits is 234365481, while the sum is 78.

The square root of 9719999979 is about 98590.0602444283. The cubic root of 9719999979 is about 2134.1359811571.

The spelling of 9719999979 in words is "nine billion, seven hundred nineteen million, nine hundred ninety-nine thousand, nine hundred seventy-nine".