18133215 has 16 divisors (see below), whose sum is σ = 29447808. Its totient is φ = 9526176.

The previous prime is 18133189. The next prime is 18133217. The reversal of 18133215 is 51233181.

It is not a de Polignac number, because 18133215 - 2⁹ = 18132703 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18133217) 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, 8017 + ... + 10026.

It is an arithmetic number, because the mean of its divisors is an integer number (1840488).

Almost surely, 2^18133215 is an apocalyptic number.

18133215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18133215 is a deficient number, since it is larger than the sum of its proper divisors (11314593).

18133215 is a wasteful number, since it uses less digits than its factorization.

18133215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18118.

The product of its digits is 720, while the sum is 24.

The square root of 18133215 is about 4258.3112850049. The cubic root of 18133215 is about 262.7190733540.

Adding to 18133215 its reverse (51233181), we get a palindrome (69366396).

The spelling of 18133215 in words is "eighteen million, one hundred thirty-three thousand, two hundred fifteen".