13646689 has 4 divisors (see below), whose sum is σ = 15596224. Its totient is φ = 11697156.

The previous prime is 13646687. The next prime is 13646701. The reversal of 13646689 is 98664631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98664631 = 13 ⋅7589587.

It is a cyclic number.

It is not a de Polignac number, because 13646689 - 2¹ = 13646687 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13646683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 974757 + ... + 974770.

It is an arithmetic number, because the mean of its divisors is an integer number (3899056).

Almost surely, 2^13646689 is an apocalyptic number.

It is an amenable number.

13646689 is a deficient number, since it is larger than the sum of its proper divisors (1949535).

13646689 is an equidigital number, since it uses as much as digits as its factorization.

13646689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1949534.

The product of its digits is 186624, while the sum is 43.

The square root of 13646689 is about 3694.1425256749. The cubic root of 13646689 is about 238.9694760946.

The spelling of 13646689 in words is "thirteen million, six hundred forty-six thousand, six hundred eighty-nine".