13979138394 has 64 divisors (see below), whose sum is σ = 31728735360. Its totient is φ = 4070373120.

The previous prime is 13979138377. The next prime is 13979138423. The reversal of 13979138394 is 49383197931.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1472824 + ... + 1482284.

It is an arithmetic number, because the mean of its divisors is an integer number (495761490).

Almost surely, 2^13979138394 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13979138394, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15864367680).

13979138394 is an abundant number, since it is smaller than the sum of its proper divisors (17749596966).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13979138394 is a wasteful number, since it uses less digits than its factorization.

13979138394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10495.

The product of its digits is 4408992, while the sum is 57.

The spelling of 13979138394 in words is "thirteen billion, nine hundred seventy-nine million, one hundred thirty-eight thousand, three hundred ninety-four".