12786909 has 4 divisors (see below), whose sum is σ = 17049216. Its totient is φ = 8524604.

The previous prime is 12786901. The next prime is 12786913. The reversal of 12786909 is 90968721.

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 not a de Polignac number, because 12786909 - 2³ = 12786901 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12786901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2131149 + ... + 2131154.

It is an arithmetic number, because the mean of its divisors is an integer number (4262304).

Almost surely, 2^12786909 is an apocalyptic number.

It is an amenable number.

12786909 is a deficient number, since it is larger than the sum of its proper divisors (4262307).

12786909 is an equidigital number, since it uses as much as digits as its factorization.

12786909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4262306.

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 12786909 is about 3575.8787731130. The cubic root of 12786909 is about 233.8416453630.

It can be divided in two parts, 12786 and 909, that added together give a triangular number (13695 = T₁₆₅).

The spelling of 12786909 in words is "twelve million, seven hundred eighty-six thousand, nine hundred nine".