12189209 has 4 divisors (see below), whose sum is σ = 12360960. Its totient is φ = 12017460.

The previous prime is 12189181. The next prime is 12189257. The reversal of 12189209 is 90298121.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90298121 = 241 ⋅374681.

It is not a de Polignac number, because 12189209 - 2¹² = 12185113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12189269) 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, 85769 + ... + 85910.

It is an arithmetic number, because the mean of its divisors is an integer number (3090240).

Almost surely, 2^12189209 is an apocalyptic number.

It is an amenable number.

12189209 is a deficient number, since it is larger than the sum of its proper divisors (171751).

12189209 is an equidigital number, since it uses as much as digits as its factorization.

12189209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171750.

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

The square root of 12189209 is about 3491.3047704261. The cubic root of 12189209 is about 230.1398582271.

The spelling of 12189209 in words is "twelve million, one hundred eighty-nine thousand, two hundred nine".