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Is 4200 a perfect number? [SOLVED]

Answer

4200 is not perfect because:

1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 10 + 12 + 14 + 15 + 20 + 21 + 24 + 25 + 28 + 30 + 35 + 40 + 42 + 50 + 56 + 60 + 70 + 75 + 84 + 100 + 105 + 120 + 140 + 150 + 168 + 175 + 200 + 210 + 280 + 300 + 350 + 420 + 525 + 600 + 700 + 840 + 1050 + 1400 + 2100 ≠ 4200
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