12870257 has 4 divisors (see below), whose sum is σ = 12878580. Its totient is φ = 12861936.

The previous prime is 12870233. The next prime is 12870259. The reversal of 12870257 is 75207821.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 5340721 + 7529536 = 2311^2 + 2744^2 .

It is a cyclic number.

It is not a de Polignac number, because 12870257 - 2⁸ = 12870001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12870259) 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, 1082 + ... + 5187.

It is an arithmetic number, because the mean of its divisors is an integer number (3219645).

Almost surely, 2^12870257 is an apocalyptic number.

It is an amenable number.

12870257 is a deficient number, since it is larger than the sum of its proper divisors (8323).

12870257 is an equidigital number, since it uses as much as digits as its factorization.

12870257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8322.

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 12870257 is about 3587.5140417844. The cubic root of 12870257 is about 234.3486232124.

The spelling of 12870257 in words is "twelve million, eight hundred seventy thousand, two hundred fifty-seven".