12644869 has 4 divisors (see below), whose sum is σ = 13052800. Its totient is φ = 12236940.

The previous prime is 12644867. The next prime is 12644893. The reversal of 12644869 is 96844621.

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: 96844621 = 53 ⋅1827257.

It is not a de Polignac number, because 12644869 - 2¹ = 12644867 is a prime.

It is a super-2 number, since 2×12644869² = 319785424054322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12644867) 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, 203919 + ... + 203980.

It is an arithmetic number, because the mean of its divisors is an integer number (3263200).

Almost surely, 2^12644869 is an apocalyptic number.

It is an amenable number.

12644869 is a deficient number, since it is larger than the sum of its proper divisors (407931).

12644869 is an equidigital number, since it uses as much as digits as its factorization.

12644869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407930.

The product of its digits is 82944, while the sum is 40.

The square root of 12644869 is about 3555.9624576196. The cubic root of 12644869 is about 232.9725633421.

The spelling of 12644869 in words is "twelve million, six hundred forty-four thousand, eight hundred sixty-nine".