13991888 has 20 divisors (see below), whose sum is σ = 27170880. Its totient is φ = 6980064.

The previous prime is 13991869. The next prime is 13991897. The reversal of 13991888 is 88819931.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9881 + ... + 11207.

It is an arithmetic number, because the mean of its divisors is an integer number (1358544).

Almost surely, 2^13991888 is an apocalyptic number.

It is an amenable number.

13991888 is a deficient number, since it is larger than the sum of its proper divisors (13178992).

13991888 is a wasteful number, since it uses less digits than its factorization.

13991888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1994 (or 1988 counting only the distinct ones).

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

The square root of 13991888 is about 3740.5732181044. The cubic root of 13991888 is about 240.9676672475.

The spelling of 13991888 in words is "thirteen million, nine hundred ninety-one thousand, eight hundred eighty-eight".