13568639 has 12 divisors (see below), whose sum is σ = 16023384. Its totient is φ = 11453904.

The previous prime is 13568627. The next prime is 13568707. The reversal of 13568639 is 93686531.

13568639 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13568639 - 2⁴ = 13568623 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13568596 and 13568605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13568039) 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, 1217 + ... + 5349.

It is an arithmetic number, because the mean of its divisors is an integer number (1335282).

Almost surely, 2^13568639 is an apocalyptic number.

13568639 is a deficient number, since it is larger than the sum of its proper divisors (2454745).

13568639 is an equidigital number, since it uses as much as digits as its factorization.

13568639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4214 (or 4207 counting only the distinct ones).

The product of its digits is 116640, while the sum is 41.

The square root of 13568639 is about 3683.5633563168. The cubic root of 13568639 is about 238.5130225373.

The spelling of 13568639 in words is "thirteen million, five hundred sixty-eight thousand, six hundred thirty-nine".