13968891 has 12 divisors (see below), whose sum is σ = 20218432. Its totient is φ = 9293616.

The previous prime is 13968887. The next prime is 13968907. The reversal of 13968891 is 19886931.

It is not a de Polignac number, because 13968891 - 2² = 13968887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13968811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4185 + ... + 6741.

Almost surely, 2^13968891 is an apocalyptic number.

13968891 is a deficient number, since it is larger than the sum of its proper divisors (6249541).

13968891 is a wasteful number, since it uses less digits than its factorization.

13968891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3170 (or 3167 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 13968891 is about 3737.4979598657. The cubic root of 13968891 is about 240.8355770861.

The spelling of 13968891 in words is "thirteen million, nine hundred sixty-eight thousand, eight hundred ninety-one".