12644013 has 4 divisors (see below), whose sum is σ = 16858688. Its totient is φ = 8429340.

The previous prime is 12643999. The next prime is 12644017. The reversal of 12644013 is 31044621.

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: 31044621 = 3 ⋅10348207.

It is not a de Polignac number, because 12644013 - 2¹⁶ = 12578477 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 (12644017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2107333 + ... + 2107338.

It is an arithmetic number, because the mean of its divisors is an integer number (4214672).

Almost surely, 2^12644013 is an apocalyptic number.

It is an amenable number.

12644013 is a deficient number, since it is larger than the sum of its proper divisors (4214675).

12644013 is an equidigital number, since it uses as much as digits as its factorization.

12644013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4214674.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 12644013 is about 3555.8420943568. The cubic root of 12644013 is about 232.9673061632.

Adding to 12644013 its reverse (31044621), we get a palindrome (43688634).

The spelling of 12644013 in words is "twelve million, six hundred forty-four thousand, thirteen".