12644143 has 4 divisors (see below), whose sum is σ = 12693600. Its totient is φ = 12594688.

The previous prime is 12644129. The next prime is 12644147. The reversal of 12644143 is 34144621.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12644143 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 (12644147) 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, 24343 + ... + 24856.

It is an arithmetic number, because the mean of its divisors is an integer number (3173400).

Almost surely, 2^12644143 is an apocalyptic number.

12644143 is a deficient number, since it is larger than the sum of its proper divisors (49457).

12644143 is an equidigital number, since it uses as much as digits as its factorization.

12644143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49456.

The product of its digits is 2304, while the sum is 25.

The square root of 12644143 is about 3555.8603740867. The cubic root of 12644143 is about 232.9681045818.

Adding to 12644143 its reverse (34144621), we get a palindrome (46788764).

The spelling of 12644143 in words is "twelve million, six hundred forty-four thousand, one hundred forty-three".