12644447 has 4 divisors (see below), whose sum is σ = 13388256. Its totient is φ = 11900640.

The previous prime is 12644393. The next prime is 12644459. The reversal of 12644447 is 74444621.

12644447 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 12644447 - 2¹² = 12640351 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 (12644477) 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, 371879 + ... + 371912.

It is an arithmetic number, because the mean of its divisors is an integer number (3347064).

Almost surely, 2^12644447 is an apocalyptic number.

12644447 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

12644447 is a deficient number, since it is larger than the sum of its proper divisors (743809).

12644447 is an equidigital number, since it uses as much as digits as its factorization.

12644447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 743808.

The product of its digits is 21504, while the sum is 32.

The square root of 12644447 is about 3555.9031201651. The cubic root of 12644447 is about 232.9699716317.

The spelling of 12644447 in words is "twelve million, six hundred forty-four thousand, four hundred forty-seven".