12785009 has 4 divisors (see below), whose sum is σ = 12793200. Its totient is φ = 12776820.

The previous prime is 12784999. The next prime is 12785011. The reversal of 12785009 is 90058721.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12785009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12785089) 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, 947 + ... + 5144.

It is an arithmetic number, because the mean of its divisors is an integer number (3198300).

Almost surely, 2^12785009 is an apocalyptic number.

It is an amenable number.

12785009 is a deficient number, since it is larger than the sum of its proper divisors (8191).

12785009 is an equidigital number, since it uses as much as digits as its factorization.

12785009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8190.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 12785009 is about 3575.6130942819. The cubic root of 12785009 is about 233.8300626541.

The spelling of 12785009 in words is "twelve million, seven hundred eighty-five thousand, nine".