18643

18643 is a number that falls within the range of 18,000 to 19,000. It is an even number, as it ends in the digit 3, which is not divisible by 2. In the decimal system, it is written as 18,643. In scientific notation, it is expressed as 1.8643 x 10^4. The number 18643 is also known as eighteen thousand six hundred forty-three in words. It is a natural number, meaning it is a positive integer that is not a fraction or decimal. In the context of mathematics, 18643 is a composite number, as it has factors other than 1 and itself. Its prime factorization is 3 x 7 x 7 x 7 x 7, which means it is the product of the prime numbers 3 and 7, each raised to the power of 3. The number 18643 is also a Harshad number, also known as a Niven number, meaning it is divisible by the sum of its digits, which is 22. In the context of astronomy, 18643 is the designation for the asteroid (18643) 1998 DK35, discovered in 1998.