22008809 has 4 divisors (see below), whose sum is σ = 22226820. Its totient is φ = 21790800.

The previous prime is 22008799. The next prime is 22008817. The reversal of 22008809 is 90880022.

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 12054784 + 9954025 = 3472^2 + 3155^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22008809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22008839) 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, 108854 + ... + 109055.

It is an arithmetic number, because the mean of its divisors is an integer number (5556705).

Almost surely, 2^22008809 is an apocalyptic number.

It is an amenable number.

22008809 is a deficient number, since it is larger than the sum of its proper divisors (218011).

22008809 is a wasteful number, since it uses less digits than its factorization.

22008809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218010.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 22008809 is about 4691.3547083971. The cubic root of 22008809 is about 280.2413268091.

The spelling of 22008809 in words is "twenty-two million, eight thousand, eight hundred nine".