79839831930389 has 4 divisors (see below), whose sum is σ = 79852978623756. Its totient is φ = 79826685237024.

The previous prime is 79839831930371. The next prime is 79839831930427. The reversal of 79839831930389 is 98303913893897.

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

It can be written as a sum of positive squares in 2 ways, for example, as 67628008140625 + 12211823789764 = 8223625^2 + 3494542^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79839831930389 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79839830930389) 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, 6573337574 + ... + 6573349719.

It is an arithmetic number, because the mean of its divisors is an integer number (19963244655939).

Almost surely, 2^{79839831930389} is an apocalyptic number.

It is an amenable number.

79839831930389 is a deficient number, since it is larger than the sum of its proper divisors (13146693367).

79839831930389 is a wasteful number, since it uses less digits than its factorization.

79839831930389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13146693366.

The product of its (nonzero) digits is 1904684544, while the sum is 80.

The spelling of 79839831930389 in words is "seventy-nine trillion, eight hundred thirty-nine billion, eight hundred thirty-one million, nine hundred thirty thousand, three hundred eighty-nine".