18398222 has 16 divisors (see below), whose sum is σ = 28090800. Its totient is φ = 9036288.

The previous prime is 18398207. The next prime is 18398227. The reversal of 18398222 is 22289381.

It is a super-2 number, since 2×18398222² = 676989145522568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18398227) 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 7 ways as a sum of consecutive naturals, for example, 31598 + ... + 32174.

It is an arithmetic number, because the mean of its divisors is an integer number (1755675).

Almost surely, 2^18398222 is an apocalyptic number.

18398222 is a deficient number, since it is larger than the sum of its proper divisors (9692578).

18398222 is a wasteful number, since it uses less digits than its factorization.

18398222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 835.

The product of its digits is 13824, while the sum is 35.

The square root of 18398222 is about 4289.3148637049. The cubic root of 18398222 is about 263.9927205676.

The spelling of 18398222 in words is "eighteen million, three hundred ninety-eight thousand, two hundred twenty-two".