18164217 has 4 divisors (see below), whose sum is σ = 24218960. Its totient is φ = 12109476.

The previous prime is 18164173. The next prime is 18164221. The reversal of 18164217 is 71246181.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 18164217 - 2⁸ = 18163961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18164257) 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 3 ways as a sum of consecutive naturals, for example, 3027367 + ... + 3027372.

It is an arithmetic number, because the mean of its divisors is an integer number (6054740).

Almost surely, 2^18164217 is an apocalyptic number.

It is an amenable number.

18164217 is a deficient number, since it is larger than the sum of its proper divisors (6054743).

18164217 is an equidigital number, since it uses as much as digits as its factorization.

18164217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6054742.

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

The square root of 18164217 is about 4261.9499058530. The cubic root of 18164217 is about 262.8687099819.

It can be divided in two parts, 18164 and 217, that added together give a palindrome (18381).

The spelling of 18164217 in words is "eighteen million, one hundred sixty-four thousand, two hundred seventeen".