18222215 has 16 divisors (see below), whose sum is σ = 25259040. Its totient is φ = 12472320.

The previous prime is 18222173. The next prime is 18222223. The reversal of 18222215 is 51222281.

It is not a de Polignac number, because 18222215 - 2⁶ = 18222151 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8810 + ... + 10679.

It is an arithmetic number, because the mean of its divisors is an integer number (1578690).

Almost surely, 2^18222215 is an apocalyptic number.

18222215 is a deficient number, since it is larger than the sum of its proper divisors (7036825).

18222215 is a wasteful number, since it uses less digits than its factorization.

18222215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19522.

The product of its digits is 640, while the sum is 23.

The square root of 18222215 is about 4268.7486456806. The cubic root of 18222215 is about 263.1481910001.

Adding to 18222215 its reverse (51222281), we get a palindrome (69444496).

The spelling of 18222215 in words is "eighteen million, two hundred twenty-two thousand, two hundred fifteen".