12644431 has 4 divisors (see below), whose sum is σ = 12652864. Its totient is φ = 12636000.

The previous prime is 12644393. The next prime is 12644459. The reversal of 12644431 is 13444621.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12644431 - 2⁹ = 12643919 is a prime.

It is a super-2 number, since 2×12644431² = 319763270627522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12644396 and 12644405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12644831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1290 + ... + 5191.

It is an arithmetic number, because the mean of its divisors is an integer number (3163216).

Almost surely, 2^12644431 is an apocalyptic number.

12644431 is a deficient number, since it is larger than the sum of its proper divisors (8433).

12644431 is an equidigital number, since it uses as much as digits as its factorization.

12644431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8432.

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

The square root of 12644431 is about 3555.9008703843. The cubic root of 12644431 is about 232.9698733666.

The spelling of 12644431 in words is "twelve million, six hundred forty-four thousand, four hundred thirty-one".