22209 has 8 divisors (see below), whose sum is σ = 32352. Its totient is φ = 13440.

The previous prime is 22193. The next prime is 22229. The reversal of 22209 is 90222.

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

It is not a de Polignac number, because 22209 - 2⁴ = 22193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 304 + ... + 369.

It is an arithmetic number, because the mean of its divisors is an integer number (4044).

2²²²⁰⁹ is an apocalyptic number.

It is an amenable number.

22209 is a deficient number, since it is larger than the sum of its proper divisors (10143).

22209 is a wasteful number, since it uses less digits than its factorization.

22209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 22209 is about 149.0268432196. The cubic root of 22209 is about 28.1088450434.

It can be divided in two parts, 22 and 209, that added together give a triangular number (231 = T₂₁).

The spelling of 22209 in words is "twenty-two thousand, two hundred nine".