13878917793 has 36 divisors (see below), whose sum is σ = 22934153788. Its totient is φ = 8038448640.

The previous prime is 13878917779. The next prime is 13878917851. The reversal of 13878917793 is 39771987831.

13878917793 is a `hidden beast` number, since 1 + 387 + 89 + 177 + 9 + 3 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 46335249 + 13832582544 = 6807^2 + 117612^2 .

It is not a de Polignac number, because 13878917793 - 2⁶ = 13878917729 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 13878917793.

It is not an unprimeable number, because it can be changed into a prime (13878917993) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 171418 + ... + 239043.

Almost surely, 2^13878917793 is an apocalyptic number.

13878917793 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

13878917793 is a deficient number, since it is larger than the sum of its proper divisors (9055235995).

13878917793 is a wasteful number, since it uses less digits than its factorization.

13878917793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410514 (or 410494 counting only the distinct ones).

The product of its digits is 16003008, while the sum is 63.

The spelling of 13878917793 in words is "thirteen billion, eight hundred seventy-eight million, nine hundred seventeen thousand, seven hundred ninety-three".