22409 has 2 divisors, whose sum is σ = 22410. Its totient is φ = 22408.

The previous prime is 22397. The next prime is 22433. The reversal of 22409 is 90422.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19600 + 2809 = 140^2 + 53^2 .

It is a cyclic number.

It is not a de Polignac number, because 22409 - 2⁸ = 22153 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a plaindrome in base 7 and base 16.

It is not a weakly prime, because it can be changed into another prime (22469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11204 + 11205.

It is an arithmetic number, because the mean of its divisors is an integer number (11205).

2²²⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

22409 is a deficient number, since it is larger than the sum of its proper divisors (1).

22409 is an equidigital number, since it uses as much as digits as its factorization.

22409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 22409 is about 149.6963593412. The cubic root of 22409 is about 28.1929697614.

It can be divided in two parts, 22 and 409, that multiplied together give a palindrome (8998).

The spelling of 22409 in words is "twenty-two thousand, four hundred nine".