12660409 has 2 divisors, whose sum is σ = 12660410. Its totient is φ = 12660408.

The previous prime is 12660377. The next prime is 12660413. The reversal of 12660409 is 90406621.

12660409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11799225 + 861184 = 3435^2 + 928^2 .

It is a cyclic number.

It is not a de Polignac number, because 12660409 - 2⁵ = 12660377 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12760409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6330204 + 6330205.

It is an arithmetic number, because the mean of its divisors is an integer number (6330205).

Almost surely, 2^12660409 is an apocalyptic number.

It is an amenable number.

12660409 is a deficient number, since it is larger than the sum of its proper divisors (1).

12660409 is an equidigital number, since it uses as much as digits as its factorization.

12660409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 12660409 is about 3558.1468491337. The cubic root of 12660409 is about 233.0679620250.

The spelling of 12660409 in words is "twelve million, six hundred sixty thousand, four hundred nine".