13656999 has 12 divisors (see below), whose sum is σ = 18862376. Its totient is φ = 8789088.

The previous prime is 13656989. The next prime is 13657003. The reversal of 13656999 is 99965631.

13656999 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13656999 - 2¹⁵ = 13624231 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13656989) 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, 184 + ... + 5229.

Almost surely, 2^13656999 is an apocalyptic number.

13656999 is a deficient number, since it is larger than the sum of its proper divisors (5205377).

13656999 is an equidigital number, since it uses as much as digits as its factorization.

13656999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5474 (or 5445 counting only the distinct ones).

The product of its digits is 393660, while the sum is 48.

The square root of 13656999 is about 3695.5377145958. The cubic root of 13656999 is about 239.0296409962.

The spelling of 13656999 in words is "thirteen million, six hundred fifty-six thousand, nine hundred ninety-nine".