22409209 has 4 divisors (see below), whose sum is σ = 22538916. Its totient is φ = 22279504.

The previous prime is 22409183. The next prime is 22409237. The reversal of 22409209 is 90290422.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20976400 + 1432809 = 4580^2 + 1197^2 .

It is a cyclic number.

It is not a de Polignac number, because 22409209 - 2¹³ = 22401017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22409239) 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, 64594 + ... + 64939.

It is an arithmetic number, because the mean of its divisors is an integer number (5634729).

Almost surely, 2^22409209 is an apocalyptic number.

It is an amenable number.

22409209 is a deficient number, since it is larger than the sum of its proper divisors (129707).

22409209 is a wasteful number, since it uses less digits than its factorization.

22409209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129706.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 22409209 is about 4733.8366047003. The cubic root of 22409209 is about 281.9305740936.

It can be divided in two parts, 2240 and 9209, that added together give a square (11449 = 107²).

The spelling of 22409209 in words is "twenty-two million, four hundred nine thousand, two hundred nine".