18668217 has 8 divisors (see below), whose sum is σ = 25232224. Its totient is φ = 12274848.

The previous prime is 18668213. The next prime is 18668263. The reversal of 18668217 is 71286681.

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

It is not a de Polignac number, because 18668217 - 2² = 18668213 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18668213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42403 + ... + 42840.

It is an arithmetic number, because the mean of its divisors is an integer number (3154028).

Almost surely, 2^18668217 is an apocalyptic number.

It is an amenable number.

18668217 is a deficient number, since it is larger than the sum of its proper divisors (6564007).

18668217 is an equidigital number, since it uses as much as digits as its factorization.

18668217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85319.

The product of its digits is 32256, while the sum is 39.

The square root of 18668217 is about 4320.6732114336. The cubic root of 18668217 is about 265.2778242101.

The spelling of 18668217 in words is "eighteen million, six hundred sixty-eight thousand, two hundred seventeen".