22388209 has 4 divisors (see below), whose sum is σ = 22410916. Its totient is φ = 22365504.

The previous prime is 22388189. The next prime is 22388221. The reversal of 22388209 is 90288322.

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 21902400 + 485809 = 4680^2 + 697^2 .

It is a cyclic number.

It is not a de Polignac number, because 22388209 - 2²¹ = 20291057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22386209) 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, 9804 + ... + 11869.

It is an arithmetic number, because the mean of its divisors is an integer number (5602729).

Almost surely, 2^22388209 is an apocalyptic number.

It is an amenable number.

22388209 is a deficient number, since it is larger than the sum of its proper divisors (22707).

22388209 is a wasteful number, since it uses less digits than its factorization.

22388209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22706.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 22388209 is about 4731.6180107866. The cubic root of 22388209 is about 281.8424794710.

The spelling of 22388209 in words is "twenty-two million, three hundred eighty-eight thousand, two hundred nine".