13992644 has 18 divisors (see below), whose sum is σ = 25111002. Its totient is φ = 6822400.

The previous prime is 13992637. The next prime is 13992731. The reversal of 13992644 is 44629931.

It can be written as a sum of positive squares in 3 ways, for example, as 743044 + 13249600 = 862^2 + 3640^2 .

It is a super-2 number, since 2×13992644² = 391588172221472, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13992598 and 13992607.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5684 + ... + 7764.

Almost surely, 2^13992644 is an apocalyptic number.

It is an amenable number.

13992644 is a deficient number, since it is larger than the sum of its proper divisors (11118358).

13992644 is a wasteful number, since it uses less digits than its factorization.

13992644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2167 (or 2124 counting only the distinct ones).

The product of its digits is 46656, while the sum is 38.

The square root of 13992644 is about 3740.6742707699. The cubic root of 13992644 is about 240.9720071020.

The spelling of 13992644 in words is "thirteen million, nine hundred ninety-two thousand, six hundred forty-four".