22191808 has 28 divisors (see below), whose sum is σ = 44375832. Its totient is φ = 11010560.

The previous prime is 22191797. The next prime is 22191809. The reversal of 22191808 is 80819122.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 22191808.

It is not an unprimeable number, because it can be changed into a prime (22191809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7503 + ... + 10033.

Almost surely, 2^22191808 is an apocalyptic number.

It is an amenable number.

22191808 is a deficient number, since it is larger than the sum of its proper divisors (22184024).

22191808 is a wasteful number, since it uses less digits than its factorization.

22191808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2680 (or 2670 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 22191808 is about 4710.8181879584. The cubic root of 22191808 is about 281.0159014654.

It can be divided in two parts, 221 and 91808, that added together give a palindrome (92029).

The spelling of 22191808 in words is "twenty-two million, one hundred ninety-one thousand, eight hundred eight".