18206218 has 16 divisors (see below), whose sum is σ = 30438720. Its totient is φ = 8116416.

The previous prime is 18206203. The next prime is 18206219. The reversal of 18206218 is 81260281.

It is not an unprimeable number, because it can be changed into a prime (18206219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13446 + ... + 14737.

It is an arithmetic number, because the mean of its divisors is an integer number (1902420).

Almost surely, 2^18206218 is an apocalyptic number.

18206218 is a deficient number, since it is larger than the sum of its proper divisors (12232502).

18206218 is a wasteful number, since it uses less digits than its factorization.

18206218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28221.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 18206218 is about 4266.8745001464. The cubic root of 18206218 is about 263.0711638832.

Adding to 18206218 its reverse (81260281), we get a palindrome (99466499).

The spelling of 18206218 in words is "eighteen million, two hundred six thousand, two hundred eighteen".