18227215 has 16 divisors (see below), whose sum is σ = 22353408. Its totient is φ = 14265376.

The previous prime is 18227203. The next prime is 18227219. The reversal of 18227215 is 51272281.

It is not a de Polignac number, because 18227215 - 2⁷ = 18227087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18227219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69174 + ... + 69436.

It is an arithmetic number, because the mean of its divisors is an integer number (1397088).

Almost surely, 2^18227215 is an apocalyptic number.

18227215 is a deficient number, since it is larger than the sum of its proper divisors (4126193).

18227215 is a wasteful number, since it uses less digits than its factorization.

18227215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518.

The product of its digits is 2240, while the sum is 28.

The square root of 18227215 is about 4269.3342572350. The cubic root of 18227215 is about 263.1722572407.

Adding to 18227215 its reverse (51272281), we get a palindrome (69499496).

The spelling of 18227215 in words is "eighteen million, two hundred twenty-seven thousand, two hundred fifteen".