12209 has 4 divisors (see below), whose sum is σ = 12660.
Its totient is φ = 11760.
The previous prime is 12203. The next prime is 12211. The reversal of 12209 is 90221.
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90221 = 83 ⋅1087.
It can be written as a sum of positive squares in 2 ways, for example, as 2209 + 10000 = 47^2 + 100^2
It is a cyclic number.
It is not a de Polignac number, because 12209 - 28 = 11953 is a prime.
It is a Duffinian number.
It is a Curzon number.
It is a junction number, because it is equal to n+sod(n) for n = 12193 and 12202.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (12203) 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, 182 + ... + 239.
It is an arithmetic number, because the mean of its divisors is an integer number (3165).
It is the magic constant of a 29 × 29 magic square.
212209 is an apocalyptic number.
It is an amenable number.
12209 is a deficient number, since it is larger than the sum of its proper divisors (451).
12209 is an equidigital number, since it uses as much as digits as its factorization.
12209 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 450.
The product of its (nonzero) digits is 36, while the sum is 14.
The square root of 12209 is about 110.4943437466.
The cubic root of 12209 is about 23.0264346345.
The spelling of 12209 in words is "twelve thousand, two hundred nine".