12685689 has 12 divisors (see below), whose sum is σ = 19401876. Its totient is φ = 7959552.

The previous prime is 12685681. The next prime is 12685733. The reversal of 12685689 is 98658621.

It can be written as a sum of positive squares in 2 ways, for example, as 6350400 + 6335289 = 2520^2 + 2517^2 .

It is not a de Polignac number, because 12685689 - 2³ = 12685681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12685681) 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 11 ways as a sum of consecutive naturals, for example, 41304 + ... + 41609.

It is an arithmetic number, because the mean of its divisors is an integer number (1616823).

Almost surely, 2^12685689 is an apocalyptic number.

It is an amenable number.

12685689 is a deficient number, since it is larger than the sum of its proper divisors (6716187).

12685689 is a wasteful number, since it uses less digits than its factorization.

12685689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82936 (or 82933 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 12685689 is about 3561.6974885579. The cubic root of 12685689 is about 233.2229870531. Note that the first 3 decimals are identical.

The spelling of 12685689 in words is "twelve million, six hundred eighty-five thousand, six hundred eighty-nine".