13881838887 has 28 divisors (see below), whose sum is σ = 23786565520. Its totient is φ = 7932476448.

The previous prime is 13881838879. The next prime is 13881838891. The reversal of 13881838887 is 78883818831.

It is not a de Polignac number, because 13881838887 - 2³ = 13881838879 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13881838787) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 1355062 + ... + 1365267.

Almost surely, 2^13881838887 is an apocalyptic number.

13881838887 is a deficient number, since it is larger than the sum of its proper divisors (9904726633).

13881838887 is an frugal number, since it uses more digits than its factorization.

13881838887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2720354 (or 2720339 counting only the distinct ones).

The product of its digits is 16515072, while the sum is 63.

The spelling of 13881838887 in words is "thirteen billion, eight hundred eighty-one million, eight hundred thirty-eight thousand, eight hundred eighty-seven".