12644109 has 12 divisors (see below), whose sum is σ = 18432700. Its totient is φ = 8351424.

The previous prime is 12644077. The next prime is 12644119. The reversal of 12644109 is 90144621.

12644109 is a `hidden beast` number, since 1 + 2 + 644 + 10 + 9 = 666.

12644109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 8555625 + 4088484 = 2925^2 + 2022^2 .

It is not a de Polignac number, because 12644109 - 2⁵ = 12644077 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 (12644119) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5464 + ... + 7425.

Almost surely, 2^12644109 is an apocalyptic number.

It is an amenable number.

12644109 is a deficient number, since it is larger than the sum of its proper divisors (5788591).

12644109 is a wasteful number, since it uses less digits than its factorization.

12644109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13004 (or 13001 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 12644109 is about 3555.8555932433. The cubic root of 12644109 is about 232.9678957652.

The spelling of 12644109 in words is "twelve million, six hundred forty-four thousand, one hundred nine".