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BaseRepresentation
bin100011011001011
3220212020
410123023
51034443
6215523
7103560
oct43313
926766
1018123
1112686
12a5a3
138331
146867
155583
hex46cb

18123 has 8 divisors (see below), whose sum is σ = 27648. Its totient is φ = 10344.

The previous prime is 18121. The next prime is 18127. The reversal of 18123 is 32181.

It can be divided in two parts, 18 and 123, that added together give a palindrome (141).

It is a happy number.

18123 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 18123 - 21 = 18121 is a prime.

It is an alternating number because its digits alternate between odd and even.

18123 is a lucky number.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (18121) 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, 411 + ... + 452.

It is an arithmetic number, because the mean of its divisors is an integer number (3456).

218123 is an apocalyptic number.

18123 is a deficient number, since it is larger than the sum of its proper divisors (9525).

18123 is an equidigital number, since it uses as much as digits as its factorization.

18123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 873.

The product of its digits is 48, while the sum is 15.

The square root of 18123 is about 134.6216921599. The cubic root of 18123 is about 26.2669731498.

The spelling of 18123 in words is "eighteen thousand, one hundred twenty-three".

Divisors: 1 3 7 21 863 2589 6041 18123