13991664 has 40 divisors (see below), whose sum is σ = 37315072. Its totient is φ = 4512960.

The previous prime is 13991651. The next prime is 13991687. The reversal of 13991664 is 46619931.

It is a super-2 number, since 2×13991664² = 391533322977792, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3214 + ... + 6189.

Almost surely, 2^13991664 is an apocalyptic number.

It is an amenable number.

13991664 is an abundant number, since it is smaller than the sum of its proper divisors (23323408).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13991664 is a wasteful number, since it uses less digits than its factorization.

13991664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9445 (or 9439 counting only the distinct ones).

The product of its digits is 34992, while the sum is 39.

The square root of 13991664 is about 3740.5432760496. The cubic root of 13991664 is about 240.9663813346.

The spelling of 13991664 in words is "thirteen million, nine hundred ninety-one thousand, six hundred sixty-four".