13984191978 has 16 divisors (see below), whose sum is σ = 28172534400. Its totient is φ = 4627372256.

The previous prime is 13984191941. The next prime is 13984191983. The reversal of 13984191978 is 87919148931.

13984191978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8505378 + ... + 8507021.

It is an arithmetic number, because the mean of its divisors is an integer number (1760783400).

Almost surely, 2^13984191978 is an apocalyptic number.

13984191978 is an abundant number, since it is smaller than the sum of its proper divisors (14188342422).

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

13984191978 is a wasteful number, since it uses less digits than its factorization.

13984191978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17012541.

The product of its digits is 3919104, while the sum is 60.

The spelling of 13984191978 in words is "thirteen billion, nine hundred eighty-four million, one hundred ninety-one thousand, nine hundred seventy-eight".