12443209 has 4 divisors (see below), whose sum is σ = 12458880. Its totient is φ = 12427540.

The previous prime is 12443191. The next prime is 12443219. The reversal of 12443209 is 90234421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12443209 - 2¹⁵ = 12410441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12443219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6577 + ... + 8254.

It is an arithmetic number, because the mean of its divisors is an integer number (3114720).

Almost surely, 2^12443209 is an apocalyptic number.

It is an amenable number.

12443209 is a deficient number, since it is larger than the sum of its proper divisors (15671).

12443209 is an equidigital number, since it uses as much as digits as its factorization.

12443209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15670.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 12443209 is about 3527.4933026159. The cubic root of 12443209 is about 231.7274407664.

The spelling of 12443209 in words is "twelve million, four hundred forty-three thousand, two hundred nine".