12685997 has 4 divisors (see below), whose sum is σ = 12704796. Its totient is φ = 12667200.

The previous prime is 12685991. The next prime is 12686017. The reversal of 12685997 is 79958621.

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 6280036 + 6405961 = 2506^2 + 2531^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12685997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12685991) 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, 8348 + ... + 9749.

It is an arithmetic number, because the mean of its divisors is an integer number (3176199).

Almost surely, 2^12685997 is an apocalyptic number.

It is an amenable number.

12685997 is a deficient number, since it is larger than the sum of its proper divisors (18799).

12685997 is an equidigital number, since it uses as much as digits as its factorization.

12685997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18798.

The product of its digits is 272160, while the sum is 47.

The square root of 12685997 is about 3561.7407261057. The cubic root of 12685997 is about 233.2248745369.

The spelling of 12685997 in words is "twelve million, six hundred eighty-five thousand, nine hundred ninety-seven".