18017 has 4 divisors (see below), whose sum is σ = 18480. Its totient is φ = 17556.

The previous prime is 18013. The next prime is 18041. The reversal of 18017 is 71081.

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 a cyclic number.

It is not a de Polignac number, because 18017 - 2² = 18013 is a prime.

It is a super-2 number, since 2×18017² = 649224578, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 11 and base 14.

It is a junction number, because it is equal to n+sod(n) for n = 17986 and 18004.

It is not an unprimeable number, because it can be changed into a prime (18013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 167 + ... + 252.

It is an arithmetic number, because the mean of its divisors is an integer number (4620).

2¹⁸⁰¹⁷ is an apocalyptic number.

It is an amenable number.

18017 is a deficient number, since it is larger than the sum of its proper divisors (463).

18017 is an equidigital number, since it uses as much as digits as its factorization.

18017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462.

The product of its (nonzero) digits is 56, while the sum is 17.

The square root of 18017 is about 134.2274189575. The cubic root of 18017 is about 26.2156618282.

Adding to 18017 its reverse (71081), we get a palindrome (89098).

The spelling of 18017 in words is "eighteen thousand, seventeen".