18423 has 12 divisors (see below), whose sum is σ = 28080. Its totient is φ = 11616.

The previous prime is 18413. The next prime is 18427. The reversal of 18423 is 32481.

18423 = T₂ + T₃ + ... + T₄₇.

It is a happy number.

18423 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 18423 - 2⁹ = 17911 is a prime.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 18396 and 18405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 163 + ... + 251.

It is an arithmetic number, because the mean of its divisors is an integer number (2340).

2¹⁸⁴²³ is an apocalyptic number.

18423 is a deficient number, since it is larger than the sum of its proper divisors (9657).

18423 is a wasteful number, since it uses less digits than its factorization.

18423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118 (or 115 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 18423 is about 135.7313523104. The cubic root of 18423 is about 26.4111179068.

It can be divided in two parts, 18 and 423, that added together give a square (441 = 21²).

The spelling of 18423 in words is "eighteen thousand, four hundred twenty-three".