22194409 has 4 divisors (see below), whose sum is σ = 22498516. Its totient is φ = 21890304.

The previous prime is 22194373. The next prime is 22194427. The reversal of 22194409 is 90449122.

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 4579600 + 17614809 = 2140^2 + 4197^2 .

It is a cyclic number.

It is not a de Polignac number, because 22194409 - 2¹⁷ = 22063337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22194479) 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, 151944 + ... + 152089.

It is an arithmetic number, because the mean of its divisors is an integer number (5624629).

Almost surely, 2^22194409 is an apocalyptic number.

It is an amenable number.

22194409 is a deficient number, since it is larger than the sum of its proper divisors (304107).

22194409 is an equidigital number, since it uses as much as digits as its factorization.

22194409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304106.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 22194409 is about 4711.0942465631. The cubic root of 22194409 is about 281.0268798980.

The spelling of 22194409 in words is "twenty-two million, one hundred ninety-four thousand, four hundred nine".