18218022 has 32 divisors (see below), whose sum is σ = 37739520. Its totient is φ = 5858880.

The previous prime is 18217993. The next prime is 18218027. The reversal of 18218022 is 22081281.

It is a junction number, because it is equal to n+sod(n) for n = 18217983 and 18218001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18218027) 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 15 ways as a sum of consecutive naturals, for example, 24979 + ... + 25697.

It is an arithmetic number, because the mean of its divisors is an integer number (1179360).

Almost surely, 2^18218022 is an apocalyptic number.

18218022 is an abundant number, since it is smaller than the sum of its proper divisors (19521498).

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

18218022 is a wasteful number, since it uses less digits than its factorization.

18218022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868.

The product of its (nonzero) digits is 512, while the sum is 24.

The square root of 18218022 is about 4268.2574898898. The cubic root of 18218022 is about 263.1280056566.

The spelling of 18218022 in words is "eighteen million, two hundred eighteen thousand, twenty-two".