12587857 has 4 divisors (see below), whose sum is σ = 12606516. Its totient is φ = 12569200.

The previous prime is 12587851. The next prime is 12587867. The reversal of 12587857 is 75878521.

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 12103441 + 484416 = 3479^2 + 696^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12587857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12587851) 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, 8278 + ... + 9679.

It is an arithmetic number, because the mean of its divisors is an integer number (3151629).

Almost surely, 2^12587857 is an apocalyptic number.

It is an amenable number.

12587857 is a deficient number, since it is larger than the sum of its proper divisors (18659).

12587857 is an equidigital number, since it uses as much as digits as its factorization.

12587857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18658.

The product of its digits is 156800, while the sum is 43.

The square root of 12587857 is about 3547.9370062052. The cubic root of 12587857 is about 232.6219008500.

The spelling of 12587857 in words is "twelve million, five hundred eighty-seven thousand, eight hundred fifty-seven".