19393379979 has 4 divisors (see below), whose sum is σ = 25857839976. Its totient is φ = 12928919984.

The previous prime is 19393379923. The next prime is 19393379983. The reversal of 19393379979 is 97997339391.

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 19393379979 - 2⁷ = 19393379851 is a prime.

It is a super-2 number, since 2×19393379979² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19393379909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3232229994 + ... + 3232229999.

It is an arithmetic number, because the mean of its divisors is an integer number (6464459994).

Almost surely, 2^19393379979 is an apocalyptic number.

19393379979 is a deficient number, since it is larger than the sum of its proper divisors (6464459997).

19393379979 is an equidigital number, since it uses as much as digits as its factorization.

19393379979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6464459996.

The product of its digits is 78121827, while the sum is 69.

The spelling of 19393379979 in words is "nineteen billion, three hundred ninety-three million, three hundred seventy-nine thousand, nine hundred seventy-nine".