22194428 has 6 divisors (see below), whose sum is σ = 38840256. Its totient is φ = 11097212.

The previous prime is 22194427. The next prime is 22194437. The reversal of 22194428 is 82449122.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 22194394 and 22194403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22194427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2774300 + ... + 2774307.

It is an arithmetic number, because the mean of its divisors is an integer number (6473376).

Almost surely, 2^22194428 is an apocalyptic number.

It is an amenable number.

22194428 is a deficient number, since it is larger than the sum of its proper divisors (16645828).

22194428 is a wasteful number, since it uses less digits than its factorization.

22194428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5548611 (or 5548609 counting only the distinct ones).

The product of its digits is 9216, while the sum is 32.

The square root of 22194428 is about 4711.0962630793. The cubic root of 22194428 is about 281.0269600911.

It can be divided in two parts, 22194 and 428, that added together give a palindrome (22622).

The spelling of 22194428 in words is "twenty-two million, one hundred ninety-four thousand, four hundred twenty-eight".