18218222 has 8 divisors (see below), whose sum is σ = 29811672. Its totient is φ = 8281000.

The previous prime is 18218209. The next prime is 18218257. The reversal of 18218222 is 22281281.

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

It is a super-2 number, since 2×18218222² = 663807225682568, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18218191 and 18218200.

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, 414029 + ... + 414072.

It is an arithmetic number, because the mean of its divisors is an integer number (3726459).

Almost surely, 2^18218222 is an apocalyptic number.

18218222 is a deficient number, since it is larger than the sum of its proper divisors (11593450).

18218222 is a wasteful number, since it uses less digits than its factorization.

18218222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 828114.

The product of its digits is 1024, while the sum is 26.

The square root of 18218222 is about 4268.2809185901. The cubic root of 18218222 is about 263.1289685385.

It can be divided in two parts, 182182 and 22, that multiplied together give a palindrome (4008004).

The spelling of 18218222 in words is "eighteen million, two hundred eighteen thousand, two hundred twenty-two".