18355

18355 is the natural number that immediately follows 18354 and precedes 18356. It is a composite number, specifically a semiprime, since its prime factorization is 5 × 3671, where 3671 is prime.

Therefore its divisors are 1, 5, 3671, and 18355.

In decimal notation, 18355 ends with the digit 5, indicating divisibility by 5; it is not divisible by 2 or 3. The sum of digits is 1+8+3+5+5 = 22, so the digital root is 4 and the number is congruent to 4 mod 9 and 1 mod 3. Its binary representation is 100011110110011, its hexadecimal representation is 0x47B3, and its octal representation is 43663.

As a mathematical object, 18355 is used as an example of a semiprime and arises in various elementary number-theory contexts. It is not a prime, nor a perfect square or a triangular number.