12657409 has 2 divisors, whose sum is σ = 12657410. Its totient is φ = 12657408.

The previous prime is 12657377. The next prime is 12657419. The reversal of 12657409 is 90475621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9784384 + 2873025 = 3128^2 + 1695^2 .

It is a cyclic number.

It is not a de Polignac number, because 12657409 - 2⁵ = 12657377 is a prime.

It is not a weakly prime, because it can be changed into another prime (12657419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6328704 + 6328705.

It is an arithmetic number, because the mean of its divisors is an integer number (6328705).

Almost surely, 2^12657409 is an apocalyptic number.

It is an amenable number.

12657409 is a deficient number, since it is larger than the sum of its proper divisors (1).

12657409 is an equidigital number, since it uses as much as digits as its factorization.

12657409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 12657409 is about 3557.7252563963. The cubic root of 12657409 is about 233.0495513738.

The spelling of 12657409 in words is "twelve million, six hundred fifty-seven thousand, four hundred nine".