12730857 has 4 divisors (see below), whose sum is σ = 16974480. Its totient is φ = 8487236.

The previous prime is 12730853. The next prime is 12730877. The reversal of 12730857 is 75803721.

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.

It is a cyclic number.

It is not a de Polignac number, because 12730857 - 2² = 12730853 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12730853) 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, 2121807 + ... + 2121812.

It is an arithmetic number, because the mean of its divisors is an integer number (4243620).

Almost surely, 2^12730857 is an apocalyptic number.

It is an amenable number.

12730857 is a deficient number, since it is larger than the sum of its proper divisors (4243623).

12730857 is an equidigital number, since it uses as much as digits as its factorization.

12730857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4243622.

The product of its (nonzero) digits is 11760, while the sum is 33.

The square root of 12730857 is about 3568.0326511959. The cubic root of 12730857 is about 233.4994596995.

The spelling of 12730857 in words is "twelve million, seven hundred thirty thousand, eight hundred fifty-seven".