12438809 has 2 divisors, whose sum is σ = 12438810. Its totient is φ = 12438808.

The previous prime is 12438799. The next prime is 12438817. The reversal of 12438809 is 90883421.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10272025 + 2166784 = 3205^2 + 1472^2 .

It is a cyclic number.

It is not a de Polignac number, because 12438809 - 2⁸ = 12438553 is a prime.

It is not a weakly prime, because it can be changed into another prime (12438859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6219404 + 6219405.

It is an arithmetic number, because the mean of its divisors is an integer number (6219405).

Almost surely, 2^12438809 is an apocalyptic number.

It is an amenable number.

12438809 is a deficient number, since it is larger than the sum of its proper divisors (1).

12438809 is an equidigital number, since it uses as much as digits as its factorization.

12438809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 12438809 is about 3526.8695751332. The cubic root of 12438809 is about 231.7001241007.

The spelling of 12438809 in words is "twelve million, four hundred thirty-eight thousand, eight hundred nine".