12809219 has 4 divisors (see below), whose sum is σ = 12819720. Its totient is φ = 12798720.

The previous prime is 12809191. The next prime is 12809221. The reversal of 12809219 is 91290821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 91290821 = 1217 ⋅75013.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12809219 is a prime.

It is a super-2 number, since 2×12809219² = 328152182779922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12809299) 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, 3137 + ... + 5954.

It is an arithmetic number, because the mean of its divisors is an integer number (3204930).

Almost surely, 2^12809219 is an apocalyptic number.

12809219 is a deficient number, since it is larger than the sum of its proper divisors (10501).

12809219 is an equidigital number, since it uses as much as digits as its factorization.

12809219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10500.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 12809219 is about 3578.9969265145. The cubic root of 12809219 is about 233.9775649955.

The spelling of 12809219 in words is "twelve million, eight hundred nine thousand, two hundred nineteen".