12708257 has 4 divisors (see below), whose sum is σ = 12801156. Its totient is φ = 12615360.

The previous prime is 12708253. The next prime is 12708271. The reversal of 12708257 is 75280721.

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 4648336 + 8059921 = 2156^2 + 2839^2 .

It is a cyclic number.

It is not a de Polignac number, because 12708257 - 2² = 12708253 is a prime.

It is a super-2 number, since 2×12708257² = 322999591956098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12708253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46244 + ... + 46517.

It is an arithmetic number, because the mean of its divisors is an integer number (3200289).

Almost surely, 2^12708257 is an apocalyptic number.

It is an amenable number.

12708257 is a deficient number, since it is larger than the sum of its proper divisors (92899).

12708257 is an equidigital number, since it uses as much as digits as its factorization.

12708257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92898.

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

The square root of 12708257 is about 3564.8642330389. The cubic root of 12708257 is about 233.3612073276.

Adding to 12708257 its reverse (75280721), we get a palindrome (87988978).

The spelling of 12708257 in words is "twelve million, seven hundred eight thousand, two hundred fifty-seven".