22909 has 4 divisors (see below), whose sum is σ = 23680. Its totient is φ = 22140.

The previous prime is 22907. The next prime is 22921. The reversal of 22909 is 90922.

22909 is nontrivially palindromic in base 12.

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 a cyclic number.

It is not a de Polignac number, because 22909 - 2¹ = 22907 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22901) 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, 339 + ... + 400.

It is an arithmetic number, because the mean of its divisors is an integer number (5920).

2²²⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

22909 is a deficient number, since it is larger than the sum of its proper divisors (771).

22909 is an equidigital number, since it uses as much as digits as its factorization.

22909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 770.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 22909 is about 151.3571934201. The cubic root of 22909 is about 28.4011141532.

The spelling of 22909 in words is "twenty-two thousand, nine hundred nine".