13891988 has 24 divisors (see below), whose sum is σ = 26703264. Its totient is φ = 6271200.

The previous prime is 13891987. The next prime is 13891993. The reversal of 13891988 is 88919831.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13891987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5903 + ... + 7913.

It is an arithmetic number, because the mean of its divisors is an integer number (1112636).

Almost surely, 2^13891988 is an apocalyptic number.

It is an amenable number.

13891988 is a deficient number, since it is larger than the sum of its proper divisors (12811276).

13891988 is a wasteful number, since it uses less digits than its factorization.

13891988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2183 (or 2181 counting only the distinct ones).

The product of its digits is 124416, while the sum is 47.

The square root of 13891988 is about 3727.1957286947. The cubic root of 13891988 is about 240.3928058216.

The spelling of 13891988 in words is "thirteen million, eight hundred ninety-one thousand, nine hundred eighty-eight".