12856257 has 6 divisors (see below), whose sum is σ = 18570162. Its totient is φ = 8570832.

The previous prime is 12856253. The next prime is 12856271. The reversal of 12856257 is 75265821.

It is a happy number.

12856257 is a `hidden beast` number, since 1 + 28 + 5 + 625 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 6922161 + 5934096 = 2631^2 + 2436^2 .

It is not a de Polignac number, because 12856257 - 2² = 12856253 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12856253) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 714228 + ... + 714245.

It is an arithmetic number, because the mean of its divisors is an integer number (3095027).

Almost surely, 2^12856257 is an apocalyptic number.

It is an amenable number.

12856257 is a deficient number, since it is larger than the sum of its proper divisors (5713905).

12856257 is a wasteful number, since it uses less digits than its factorization.

12856257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1428479 (or 1428476 counting only the distinct ones).

The product of its digits is 33600, while the sum is 36.

The square root of 12856257 is about 3585.5622989986. The cubic root of 12856257 is about 234.2636191841.

The spelling of 12856257 in words is "twelve million, eight hundred fifty-six thousand, two hundred fifty-seven".