12690257 has 4 divisors (see below), whose sum is σ = 12898356. Its totient is φ = 12482160.

The previous prime is 12690199. The next prime is 12690259. The reversal of 12690257 is 75209621.

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 130321 + 12559936 = 361^2 + 3544^2 .

It is a cyclic number.

It is not a de Polignac number, because 12690257 - 2¹⁰ = 12689233 is a prime.

It is a super-2 number, since 2×12690257² = 322085245452098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12690259) 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, 103958 + ... + 104079.

It is an arithmetic number, because the mean of its divisors is an integer number (3224589).

Almost surely, 2^12690257 is an apocalyptic number.

It is an amenable number.

12690257 is a deficient number, since it is larger than the sum of its proper divisors (208099).

12690257 is an equidigital number, since it uses as much as digits as its factorization.

12690257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208098.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 12690257 is about 3562.3386981027. The cubic root of 12690257 is about 233.2509775116.

Adding to 12690257 its reverse (75209621), we get a palindrome (87899878).

The spelling of 12690257 in words is "twelve million, six hundred ninety thousand, two hundred fifty-seven".