18218622 has 16 divisors (see below), whose sum is σ = 38021760. Its totient is φ = 5808792.

The previous prime is 18218617. The next prime is 18218639. The reversal of 18218622 is 22681281.

It is a super-3 number, since 3×18218622³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18218622.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65872 + ... + 66147.

It is an arithmetic number, because the mean of its divisors is an integer number (2376360).

Almost surely, 2^18218622 is an apocalyptic number.

18218622 is an abundant number, since it is smaller than the sum of its proper divisors (19803138).

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

18218622 is a wasteful number, since it uses less digits than its factorization.

18218622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132047.

The product of its digits is 3072, while the sum is 30.

The square root of 18218622 is about 4268.3277756049. The cubic root of 18218622 is about 263.1308942810.

The spelling of 18218622 in words is "eighteen million, two hundred eighteen thousand, six hundred twenty-two".