13656647 has 4 divisors (see below), whose sum is σ = 14097216. Its totient is φ = 13216080.

The previous prime is 13656613. The next prime is 13656653. The reversal of 13656647 is 74665631.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74665631 = 881 ⋅84751.

It is a cyclic number.

It is not a de Polignac number, because 13656647 - 2⁶ = 13656583 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13656647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13656697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220238 + ... + 220299.

It is an arithmetic number, because the mean of its divisors is an integer number (3524304).

Almost surely, 2^13656647 is an apocalyptic number.

13656647 is a deficient number, since it is larger than the sum of its proper divisors (440569).

13656647 is an equidigital number, since it uses as much as digits as its factorization.

13656647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440568.

The product of its digits is 90720, while the sum is 38.

The square root of 13656647 is about 3695.4900892845. The cubic root of 13656647 is about 239.0275873689.

The spelling of 13656647 in words is "thirteen million, six hundred fifty-six thousand, six hundred forty-seven".