12740857 has 4 divisors (see below), whose sum is σ = 13037200. Its totient is φ = 12444516.

The previous prime is 12740809. The next prime is 12740867. The reversal of 12740857 is 75804721.

It is a happy number.

12740857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75804721 = 6011 ⋅12611.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12740857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12740867) 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, 148107 + ... + 148192.

It is an arithmetic number, because the mean of its divisors is an integer number (3259300).

Almost surely, 2^12740857 is an apocalyptic number.

It is an amenable number.

12740857 is a deficient number, since it is larger than the sum of its proper divisors (296343).

12740857 is an equidigital number, since it uses as much as digits as its factorization.

12740857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296342.

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 12740857 is about 3569.4337085874. The cubic root of 12740857 is about 233.5605811016.

The spelling of 12740857 in words is "twelve million, seven hundred forty thousand, eight hundred fifty-seven".