12684409 has 2 divisors, whose sum is σ = 12684410. Its totient is φ = 12684408.

The previous prime is 12684403. The next prime is 12684421. The reversal of 12684409 is 90448621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9168784 + 3515625 = 3028^2 + 1875^2 .

It is a cyclic number.

It is not a de Polignac number, because 12684409 - 2⁹ = 12683897 is a prime.

It is not a weakly prime, because it can be changed into another prime (12684403) 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 as a sum of consecutive naturals, namely, 6342204 + 6342205.

It is an arithmetic number, because the mean of its divisors is an integer number (6342205).

Almost surely, 2^12684409 is an apocalyptic number.

It is an amenable number.

12684409 is a deficient number, since it is larger than the sum of its proper divisors (1).

12684409 is an equidigital number, since it uses as much as digits as its factorization.

12684409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 12684409 is about 3561.5177944242. The cubic root of 12684409 is about 233.2151426371.

The spelling of 12684409 in words is "twelve million, six hundred eighty-four thousand, four hundred nine".