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18108 = 2232503

18108 has 18 divisors (see below), whose sum is σ = 45864. Its totient is φ = 6024.

The previous prime is 18097. The next prime is 18119. The reversal of 18108 is 80181.

Adding to 18108 its reverse (80181), we get a palindrome (98289).

It is a happy number.

18108 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (18097) and next prime (18119).

It is a tau number, because it is divible by the number of its divisors (18).

It is a Smith number, since the sum of its digits (18) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

18108 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 5 ways as a sum of consecutive naturals, for example, 216 + ... + 287.

It is an arithmetic number, because the mean of its divisors is an integer number (2548).

218108 is an apocalyptic number.

18108 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18108 is an abundant number, since it is smaller than the sum of its proper divisors (27756).

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

18108 is a wasteful number, since it uses less digits than its factorization.

18108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513 (or 508 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

The square root of 18108 is about 134.5659689520. The cubic root of 18108 is about 26.2597242884.

The spelling of 18108 in words is "eighteen thousand, one hundred eight".

Divisors: 1 2 3 4 6 9 12 18 36 503 1006 1509 2012 3018 4527 6036 9054 18108