These are the factors of 393 (the whole numbers that go into 393 evenly): 1, 3, 131, 393.
1 x 393, 3 x 131, 131 x 3, 393 x 1
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393 is a composite number. A prime number has exactly two factors, 1 and the number itself. 393 has 4 factors, 1, 3, 131, and 393, so 393 is a composite.
It is a decimal number which as a fraction is 393/1000
400
When rounding to the nearest 10, you look at the last digit and if it is greater than or equal to 5, then you add one to the next to last digit and make the last digit 0. If it is less than 5 then you simply make the last digit 0. Thus 393 rounds to 390 while 395 becomes 400.
Factors of 90 will be factors of 180.