13979722309 has 4 divisors (see below), whose sum is σ = 15976825504. Its totient is φ = 11982619116.

The previous prime is 13979722307. The next prime is 13979722327. The reversal of 13979722309 is 90322797931.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13979722309 - 2¹ = 13979722307 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13979722307) 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, 998551587 + ... + 998551600.

It is an arithmetic number, because the mean of its divisors is an integer number (3994206376).

Almost surely, 2^13979722309 is an apocalyptic number.

It is an amenable number.

13979722309 is a deficient number, since it is larger than the sum of its proper divisors (1997103195).

13979722309 is an equidigital number, since it uses as much as digits as its factorization.

13979722309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1997103194.

The product of its (nonzero) digits is 1285956, while the sum is 52.

The spelling of 13979722309 in words is "thirteen billion, nine hundred seventy-nine million, seven hundred twenty-two thousand, three hundred nine".