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18023 = 67269
BaseRepresentation
bin100011001100111
3220201112
410121213
51034043
6215235
7103355
oct43147
926645
1018023
11125a5
12a51b
138285
1467d5
155518
hex4667

18023 has 4 divisors (see below), whose sum is σ = 18360. Its totient is φ = 17688.

The previous prime is 18013. The next prime is 18041. The reversal of 18023 is 32081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32081 = 74583.

It is not a de Polignac number, because 18023 - 26 = 17959 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 17989 and 18007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68 + ... + 201.

It is an arithmetic number, because the mean of its divisors is an integer number (4590).

218023 is an apocalyptic number.

18023 is a deficient number, since it is larger than the sum of its proper divisors (337).

18023 is an equidigital number, since it uses as much as digits as its factorization.

18023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 18023 is about 134.2497672251. The cubic root of 18023 is about 26.2185716081.

The spelling of 18023 in words is "eighteen thousand, twenty-three".

Divisors: 1 67 269 18023