12644989 has 6 divisors (see below), whose sum is σ = 14709534. Its totient is φ = 10838520.

The previous prime is 12644941. The next prime is 12645011. The reversal of 12644989 is 98944621.

It can be written as a sum of positive squares in only one way, i.e., 12545764 + 99225 = 3542^2 + 315^2 .

It is not a de Polignac number, because 12644989 - 2⁹ = 12644477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12644909) 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 5 ways as a sum of consecutive naturals, for example, 128982 + ... + 129079.

It is an arithmetic number, because the mean of its divisors is an integer number (2451589).

Almost surely, 2^12644989 is an apocalyptic number.

It is an amenable number.

12644989 is a deficient number, since it is larger than the sum of its proper divisors (2064545).

12644989 is an equidigital number, since it uses as much as digits as its factorization.

12644989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258075 (or 258068 counting only the distinct ones).

The product of its digits is 124416, while the sum is 43.

The square root of 12644989 is about 3555.9793306486. The cubic root of 12644989 is about 232.9733003108.

The spelling of 12644989 in words is "twelve million, six hundred forty-four thousand, nine hundred eighty-nine".