12687809 has 4 divisors (see below), whose sum is σ = 12700416. Its totient is φ = 12675204.

The previous prime is 12687803. The next prime is 12687821. The reversal of 12687809 is 90878621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12687809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12687803) 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, 4649 + ... + 6854.

It is an arithmetic number, because the mean of its divisors is an integer number (3175104).

Almost surely, 2^12687809 is an apocalyptic number.

It is an amenable number.

12687809 is a deficient number, since it is larger than the sum of its proper divisors (12607).

12687809 is a wasteful number, since it uses less digits than its factorization.

12687809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12606.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 12687809 is about 3561.9950870264. The cubic root of 12687809 is about 233.2359782064.

The spelling of 12687809 in words is "twelve million, six hundred eighty-seven thousand, eight hundred nine".