13616639 has 4 divisors (see below), whose sum is σ = 13640424. Its totient is φ = 13592856.

The previous prime is 13616599. The next prime is 13616641. The reversal of 13616639 is 93661631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93661631 = 7 ⋅13380233.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13616639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13616599 and 13616608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13616539) 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, 11012 + ... + 12185.

It is an arithmetic number, because the mean of its divisors is an integer number (3410106).

Almost surely, 2^13616639 is an apocalyptic number.

13616639 is a deficient number, since it is larger than the sum of its proper divisors (23785).

13616639 is an equidigital number, since it uses as much as digits as its factorization.

13616639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23784.

The product of its digits is 17496, while the sum is 35.

The square root of 13616639 is about 3690.0730345076. The cubic root of 13616639 is about 238.7939436488.

It can be divided in two parts, 1361 and 6639, that added together give a cube (8000 = 20³).

The spelling of 13616639 in words is "thirteen million, six hundred sixteen thousand, six hundred thirty-nine".