12664189 has 4 divisors (see below), whose sum is σ = 12713724. Its totient is φ = 12614656.

The previous prime is 12664187. The next prime is 12664193. The reversal of 12664189 is 98146621.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11323225 + 1340964 = 3365^2 + 1158^2 .

It is a cyclic number.

It is not a de Polignac number, because 12664189 - 2¹ = 12664187 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 (12664181) 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, 24382 + ... + 24895.

It is an arithmetic number, because the mean of its divisors is an integer number (3178431).

Almost surely, 2^12664189 is an apocalyptic number.

It is an amenable number.

12664189 is a deficient number, since it is larger than the sum of its proper divisors (49535).

12664189 is an equidigital number, since it uses as much as digits as its factorization.

12664189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49534.

The product of its digits is 20736, while the sum is 37.

The square root of 12664189 is about 3558.6779848702. The cubic root of 12664189 is about 233.0911553049.

The spelling of 12664189 in words is "twelve million, six hundred sixty-four thousand, one hundred eighty-nine".