12818209 has 8 divisors (see below), whose sum is σ = 13115520. Its totient is φ = 12523056.

The previous prime is 12818191. The next prime is 12818227. The reversal of 12818209 is 90281821.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (12818191) and next prime (12818227).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12818209 - 2⁵ = 12818177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12818249) 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 in 7 ways as a sum of consecutive naturals, for example, 19122 + ... + 19780.

It is an arithmetic number, because the mean of its divisors is an integer number (1639440).

Almost surely, 2^12818209 is an apocalyptic number.

It is an amenable number.

12818209 is a deficient number, since it is larger than the sum of its proper divisors (297311).

12818209 is an equidigital number, since it uses as much as digits as its factorization.

12818209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1079.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 12818209 is about 3580.2526447166. The cubic root of 12818209 is about 234.0322903305.

The spelling of 12818209 in words is "twelve million, eight hundred eighteen thousand, two hundred nine".