12440857 has 16 divisors (see below), whose sum is σ = 14757120. Its totient is φ = 10425360.

The previous prime is 12440851. The next prime is 12440863. The reversal of 12440857 is 75804421.

It is an interprime number because it is at equal distance from previous prime (12440851) and next prime (12440863).

It is not a de Polignac number, because 12440857 - 2¹¹ = 12438809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12440851) 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, 16944 + ... + 17662.

It is an arithmetic number, because the mean of its divisors is an integer number (922320).

Almost surely, 2^12440857 is an apocalyptic number.

It is an amenable number.

12440857 is a deficient number, since it is larger than the sum of its proper divisors (2316263).

12440857 is an equidigital number, since it uses as much as digits as its factorization.

12440857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765 (or 743 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 12440857 is about 3527.1599056465. The cubic root of 12440857 is about 231.7128395681.

The spelling of 12440857 in words is "twelve million, four hundred forty thousand, eight hundred fifty-seven".