For 3960:
- 3960 is even, so divide by 2: \( 3960 \div 2 = 1980 \)
- 1980 is even, so divide by 2: \( 1980 \div 2 = 990 \)
- 990 is even, so divide by 2: \( 990 \div 2 = 495 \)
- 495 is divisible by 3: \( 495 \div 3 = 165 \)
- 165 is divisible by 3: \( 165 \div 3
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