12644237 has 2 divisors, whose sum is σ = 12644238. Its totient is φ = 12644236.

The previous prime is 12644213. The next prime is 12644239. The reversal of 12644237 is 73244621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12524521 + 119716 = 3539^2 + 346^2 .

It is a cyclic number.

It is not a de Polignac number, because 12644237 - 2¹² = 12640141 is a prime.

Together with 12644239, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12644239) 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 as a sum of consecutive naturals, namely, 6322118 + 6322119.

It is an arithmetic number, because the mean of its divisors is an integer number (6322119).

Almost surely, 2^12644237 is an apocalyptic number.

It is an amenable number.

12644237 is a deficient number, since it is larger than the sum of its proper divisors (1).

12644237 is an equidigital number, since it uses as much as digits as its factorization.

12644237 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 29.

The square root of 12644237 is about 3555.8735916790. The cubic root of 12644237 is about 232.9686818965.

Adding to 12644237 its reverse (73244621), we get a palindrome (85888858).

The spelling of 12644237 in words is "twelve million, six hundred forty-four thousand, two hundred thirty-seven".