13778813938 has 16 divisors (see below), whose sum is σ = 21111477120. Its totient is φ = 6741703696.

The previous prime is 13778813887. The next prime is 13778813947. The reversal of 13778813938 is 83931887731.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1016268 + ... + 1029736.

It is an arithmetic number, because the mean of its divisors is an integer number (1319467320).

Almost surely, 2^13778813938 is an apocalyptic number.

13778813938 is a deficient number, since it is larger than the sum of its proper divisors (7332663182).

13778813938 is a wasteful number, since it uses less digits than its factorization.

13778813938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24401.

The product of its digits is 6096384, while the sum is 58.

The spelling of 13778813938 in words is "thirteen billion, seven hundred seventy-eight million, eight hundred thirteen thousand, nine hundred thirty-eight".