12644157 has 16 divisors (see below), whose sum is σ = 17299008. Its totient is φ = 8211840.

The previous prime is 12644147. The next prime is 12644167. The reversal of 12644157 is 75144621.

It is an interprime number because it is at equal distance from previous prime (12644147) and next prime (12644167).

It is not a de Polignac number, because 12644157 - 2⁸ = 12643901 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 44538 + ... + 44820.

It is an arithmetic number, because the mean of its divisors is an integer number (1081188).

Almost surely, 2^12644157 is an apocalyptic number.

It is an amenable number.

12644157 is a deficient number, since it is larger than the sum of its proper divisors (4654851).

12644157 is a wasteful number, since it uses less digits than its factorization.

12644157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620.

The product of its digits is 6720, while the sum is 30.

The square root of 12644157 is about 3555.8623426674. The cubic root of 12644157 is about 232.9681905650.

Adding to 12644157 its reverse (75144621), we get a palindrome (87788778).

The spelling of 12644157 in words is "twelve million, six hundred forty-four thousand, one hundred fifty-seven".