13921439979 has 16 divisors (see below), whose sum is σ = 19166157824. Its totient is φ = 8979012000.

The previous prime is 13921439969. The next prime is 13921439999. The reversal of 13921439979 is 97993412931.

It is not a de Polignac number, because 13921439979 - 2²⁰ = 13920391403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13921439969) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 338904 + ... + 377754.

It is an arithmetic number, because the mean of its divisors is an integer number (1197884864).

Almost surely, 2^13921439979 is an apocalyptic number.

13921439979 is a deficient number, since it is larger than the sum of its proper divisors (5244717845).

13921439979 is a wasteful number, since it uses less digits than its factorization.

13921439979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42738.

The product of its digits is 3306744, while the sum is 57.

The spelling of 13921439979 in words is "thirteen billion, nine hundred twenty-one million, four hundred thirty-nine thousand, nine hundred seventy-nine".