12280809 has 4 divisors (see below), whose sum is σ = 16374416. Its totient is φ = 8187204.

The previous prime is 12280769. The next prime is 12280813. The reversal of 12280809 is 90808221.

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 not a de Polignac number, because 12280809 - 2²⁰ = 11232233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12280109) 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, 2046799 + ... + 2046804.

It is an arithmetic number, because the mean of its divisors is an integer number (4093604).

Almost surely, 2^12280809 is an apocalyptic number.

It is an amenable number.

12280809 is a deficient number, since it is larger than the sum of its proper divisors (4093607).

12280809 is an equidigital number, since it uses as much as digits as its factorization.

12280809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4093606.

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 12280809 is about 3504.3985218579. The cubic root of 12280809 is about 230.7149085043.

The spelling of 12280809 in words is "twelve million, two hundred eighty thousand, eight hundred nine".