12685309 has 12 divisors (see below), whose sum is σ = 15699936. Its totient is φ = 10035792.

The previous prime is 12685303. The next prime is 12685313. The reversal of 12685309 is 90358621.

It is not a de Polignac number, because 12685309 - 2⁷ = 12685181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12685303) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4179 + ... + 6544.

It is an arithmetic number, because the mean of its divisors is an integer number (1308328).

Almost surely, 2^12685309 is an apocalyptic number.

It is an amenable number.

12685309 is a deficient number, since it is larger than the sum of its proper divisors (3014627).

12685309 is a wasteful number, since it uses less digits than its factorization.

12685309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10756 (or 10743 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 12685309 is about 3561.6441428082. The cubic root of 12685309 is about 233.2206582972.

The spelling of 12685309 in words is "twelve million, six hundred eighty-five thousand, three hundred nine".