189 is divisible by: 1, 3, 7, 9, 21, 27, 63, 189.
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The factors of 189 are 1 3 7 9 21 27 63 189 So the largest factor is 189. However, 189 is not a proper factor, even though it is a factor. The largest proper factor is 63. Now 63 is not prime, since is is clearly divisible by 3. The largest prime factor is 7
210 - 189 = 21
Yes it is. If the digits of a number added together will divide exactly by three (or nine) then the number itself will also divide exactly by 3 or 9. In this case, 1+8+9=18... which is exactly divisible by 3.
The LCM of 15 and 189 is 945 because 945 is the first number that both 15 and 189 divide evenly into.
The GCF of 66 and 189 is 3.