210 has 4, which is the maximum possible. There are other numbers with 4 different prime factors.
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In prime factors (divisors) 187 = 11x17 and 1000 = 2x2x2x5x5x5 So they share no prime factors and this is referred to as being co-prime or relatively prime. In this case the highest common factor (or greatest common divisor) is 1.
The largest prime number less than 1000 is 997.The largest prime number no less than 1000 is currently 257,885,161-1
There are 31 numbers less than 1,000 which have an odd number of factors. They are: 1,4,9,16,25,36,49,64,81,100,121,144,169,196,225,256,289,324,361,400,441,484,529,576,625,676,729,784,841,900,961.
Since the numerator of the proper fraction 47/1000 is prime, the mixed number 3 47/1000 cannot be reduced any further.
The Least Common Multiple (LCM) of 10, 100, and 1,000 is 1,000.