12856557 has 8 divisors (see below), whose sum is σ = 19590976. Its totient is φ = 7346592.

The previous prime is 12856553. The next prime is 12856567. The reversal of 12856557 is 75565821.

12856557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12856557 - 2² = 12856553 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12856553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 306088 + ... + 306129.

It is an arithmetic number, because the mean of its divisors is an integer number (2448872).

Almost surely, 2^12856557 is an apocalyptic number.

It is an amenable number.

12856557 is a deficient number, since it is larger than the sum of its proper divisors (6734419).

12856557 is an equidigital number, since it uses as much as digits as its factorization.

12856557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612227.

The product of its digits is 84000, while the sum is 39.

The square root of 12856557 is about 3585.6041331971. The cubic root of 12856557 is about 234.2654413459.

The spelling of 12856557 in words is "twelve million, eight hundred fifty-six thousand, five hundred fifty-seven".