18380217 has 8 divisors (see below), whose sum is σ = 24694560. Its totient is φ = 12159680.

The previous prime is 18380203. The next prime is 18380233. The reversal of 18380217 is 71208381.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18380217 - 2¹¹ = 18378169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18380617) 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 7 ways as a sum of consecutive naturals, for example, 22992 + ... + 23777.

It is an arithmetic number, because the mean of its divisors is an integer number (3086820).

Almost surely, 2^18380217 is an apocalyptic number.

It is an amenable number.

18380217 is a deficient number, since it is larger than the sum of its proper divisors (6314343).

18380217 is a wasteful number, since it uses less digits than its factorization.

18380217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46903.

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 18380217 is about 4287.2155299215. The cubic root of 18380217 is about 263.9065756435.

Adding to 18380217 its reverse (71208381), we get a palindrome (89588598).

The spelling of 18380217 in words is "eighteen million, three hundred eighty thousand, two hundred seventeen".