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18534 = 233089

18534 has 8 divisors (see below), whose sum is σ = 37080. Its totient is φ = 6176.

The previous prime is 18523. The next prime is 18539. The reversal of 18534 is 43581.

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

18534 is an admirable number.

It is a fibodiv number, since the Fibonacci-like sequence with seeds 18 and 534 contains 18534 itself.

It is a nialpdrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 18534.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18539) by changing a digit.

18534 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1539 + ... + 1550.

It is an arithmetic number, because the mean of its divisors is an integer number (4635).

218534 is an apocalyptic number.

18534 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18540).

18534 is a wasteful number, since it uses less digits than its factorization.

18534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3094.

The product of its digits is 480, while the sum is 21.

The square root of 18534 is about 136.1396341996. The cubic root of 18534 is about 26.4640547419.

The spelling of 18534 in words is "eighteen thousand, five hundred thirty-four".

Divisors: 1 2 3 6 3089 6178 9267 18534