18216022 has 16 divisors (see below), whose sum is σ = 31377600. Its totient is φ = 7844040.

The previous prime is 18216017. The next prime is 18216043. The reversal of 18216022 is 22061281.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 18215984 and 18216002.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 21372 + ... + 22207.

It is an arithmetic number, because the mean of its divisors is an integer number (1961100).

Almost surely, 2^18216022 is an apocalyptic number.

18216022 is a deficient number, since it is larger than the sum of its proper divisors (13161578).

18216022 is a wasteful number, since it uses less digits than its factorization.

18216022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43611.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 18216022 is about 4268.0231958133. The cubic root of 18216022 is about 263.1183764504.

The spelling of 18216022 in words is "eighteen million, two hundred sixteen thousand, twenty-two".