12557857 has 4 divisors (see below), whose sum is σ = 13523860. Its totient is φ = 11591856.

The previous prime is 12557851. The next prime is 12557891. The reversal of 12557857 is 75875521.

12557857 is digitally balanced in base 3, 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.

It can be written as a sum of positive squares in 2 ways, for example, as 3370896 + 9186961 = 1836^2 + 3031^2 .

It is a cyclic number.

It is not a de Polignac number, because 12557857 - 2⁷ = 12557729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12557851) 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, 482982 + ... + 483007.

It is an arithmetic number, because the mean of its divisors is an integer number (3380965).

Almost surely, 2^12557857 is an apocalyptic number.

It is an amenable number.

12557857 is a deficient number, since it is larger than the sum of its proper divisors (966003).

12557857 is an equidigital number, since it uses as much as digits as its factorization.

12557857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 966002.

The product of its digits is 98000, while the sum is 40.

The square root of 12557857 is about 3543.7066752202. The cubic root of 12557857 is about 232.4369551960.

The spelling of 12557857 in words is "twelve million, five hundred fifty-seven thousand, eight hundred fifty-seven".