18197222 has 8 divisors (see below), whose sum is σ = 27323400. Its totient is φ = 9089424.

The previous prime is 18197219. The next prime is 18197227. The reversal of 18197222 is 22279181.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×18197222² = 662277777034568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18197227) 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 in 3 ways as a sum of consecutive naturals, for example, 1772 + ... + 6287.

It is an arithmetic number, because the mean of its divisors is an integer number (3415425).

Almost surely, 2^18197222 is an apocalyptic number.

18197222 is a deficient number, since it is larger than the sum of its proper divisors (9126178).

18197222 is a wasteful number, since it uses less digits than its factorization.

18197222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9190.

The product of its digits is 4032, while the sum is 32.

The square root of 18197222 is about 4265.8202024933. The cubic root of 18197222 is about 263.0278274420.

The spelling of 18197222 in words is "eighteen million, one hundred ninety-seven thousand, two hundred twenty-two".