18090222 has 8 divisors (see below), whose sum is σ = 36180456. Its totient is φ = 6030072.

The previous prime is 18090197. The next prime is 18090257. The reversal of 18090222 is 22209081.

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

18090222 is an admirable number.

It is a super-2 number, since 2×18090222² = 654512264018568, which contains 22 as substring.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 18090192 and 18090201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1507513 + ... + 1507524.

It is an arithmetic number, because the mean of its divisors is an integer number (4522557).

Almost surely, 2^18090222 is an apocalyptic number.

18090222 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18090222 is a wasteful number, since it uses less digits than its factorization.

18090222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3015042.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 18090222 is about 4253.2601613351. The cubic root of 18090222 is about 262.5112775200.

The spelling of 18090222 in words is "eighteen million, ninety thousand, two hundred twenty-two".