18193 has 8 divisors (see below), whose sum is σ = 21888. Its totient is φ = 14784.
The previous prime is 18191. The next prime is 18199. The reversal of 18193 is 39181.
It is a sphenic number, since it is the product of 3 distinct primes.
It is not a de Polignac number, because 18193 - 21 = 18191 is a prime.
It is an Ulam number.
It is a Duffinian number.
It is a plaindrome in base 15.
It is a nialpdrome in base 12.
It is not an unprimeable number, because it can be changed into a prime (18191) 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, 105 + ... + 217.
It is an arithmetic number, because the mean of its divisors is an integer number (2736).
218193 is an apocalyptic number.
It is an amenable number.
18193 is a deficient number, since it is larger than the sum of its proper divisors (3695).
18193 is a wasteful number, since it uses less digits than its factorization.
18193 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 143.
The product of its digits is 216, while the sum is 22.
The square root of 18193 is about 134.8814294112. The cubic root of 18193 is about 26.3007483872.
The spelling of 18193 in words is "eighteen thousand, one hundred ninety-three".
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