12647909 has 2 divisors, whose sum is σ = 12647910. Its totient is φ = 12647908.

The previous prime is 12647903. The next prime is 12647959. The reversal of 12647909 is 90974621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7344100 + 5303809 = 2710^2 + 2303^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12647909 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12647903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6323954 + 6323955.

It is an arithmetic number, because the mean of its divisors is an integer number (6323955).

Almost surely, 2^12647909 is an apocalyptic number.

It is an amenable number.

12647909 is a deficient number, since it is larger than the sum of its proper divisors (1).

12647909 is an equidigital number, since it uses as much as digits as its factorization.

12647909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 12647909 is about 3556.3898830134. The cubic root of 12647909 is about 232.9912317797.

The spelling of 12647909 in words is "twelve million, six hundred forty-seven thousand, nine hundred nine".