12644965 has 4 divisors (see below), whose sum is σ = 15173964. Its totient is φ = 10115968.

The previous prime is 12644941. The next prime is 12645011. The reversal of 12644965 is 56944621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56944621 = 251 ⋅226871.

It can be written as a sum of positive squares in 2 ways, for example, as 9084196 + 3560769 = 3014^2 + 1887^2 .

It is a cyclic number.

It is not a de Polignac number, because 12644965 - 2²¹ = 10547813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 1264492 + ... + 1264501.

It is an arithmetic number, because the mean of its divisors is an integer number (3793491).

Almost surely, 2^12644965 is an apocalyptic number.

It is an amenable number.

12644965 is a deficient number, since it is larger than the sum of its proper divisors (2528999).

12644965 is an equidigital number, since it uses as much as digits as its factorization.

12644965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2528998.

The product of its digits is 51840, while the sum is 37.

The square root of 12644965 is about 3555.9759560492. The cubic root of 12644965 is about 232.9731529174.

The spelling of 12644965 in words is "twelve million, six hundred forty-four thousand, nine hundred sixty-five".