18102217 has 12 divisors (see below), whose sum is σ = 21316176. Its totient is φ = 15325800.

The previous prime is 18102211. The next prime is 18102239. The reversal of 18102217 is 71220181.

It is not a de Polignac number, because 18102217 - 2¹¹ = 18100169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18102211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1842 + ... + 6292.

It is an arithmetic number, because the mean of its divisors is an integer number (1776348).

Almost surely, 2^18102217 is an apocalyptic number.

It is an amenable number.

18102217 is a deficient number, since it is larger than the sum of its proper divisors (3213959).

18102217 is an equidigital number, since it uses as much as digits as its factorization.

18102217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4548 (or 4541 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 22.

The square root of 18102217 is about 4254.6700224577. The cubic root of 18102217 is about 262.5692854146.

Adding to 18102217 its reverse (71220181), we get a palindrome (89322398).

The spelling of 18102217 in words is "eighteen million, one hundred two thousand, two hundred seventeen".