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18182 = 29091
BaseRepresentation
bin100011100000110
3220221102
410130012
51040212
6220102
7104003
oct43406
926842
1018182
111272a
12a632
138378
1468aa
1555c2
hex4706

18182 has 4 divisors (see below), whose sum is σ = 27276. Its totient is φ = 9090.

The previous prime is 18181. The next prime is 18191. The reversal of 18182 is 28181.

It is a semiprime because it is the product of two primes.

It is a plaindrome in base 14.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4544 + ... + 4547.

It is an arithmetic number, because the mean of its divisors is an integer number (6819).

218182 is an apocalyptic number.

18182 is a deficient number, since it is larger than the sum of its proper divisors (9094).

18182 is an equidigital number, since it uses as much as digits as its factorization.

18182 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9093.

The product of its digits is 128, while the sum is 20.

The square root of 18182 is about 134.8406466908. The cubic root of 18182 is about 26.2954465942.

Subtracting 18182 from its reverse (28181), we obtain a palindrome (9999).

The spelling of 18182 in words is "eighteen thousand, one hundred eighty-two".

Divisors: 1 2 9091 18182