489 is the ninth octahedral number. Its square root starts out in quite a memorable way: √489 ≈ 22.113344, but after those six decimal places, it looks as irrational as can be.
Print the puzzles or type the solution on this excel file: 10 Factors 2015-05-11
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- 489 is a composite number.
- Prime factorization: 489 = 3 x 163
- The exponents in the prime factorization are 1 and 1. Adding one to each and multiplying we get (1 + 1)(1 + 1) = 2 x 2 = 4. Therefore 489 has exactly 4 factors.
- Factors of 489: 1, 3, 163, 489
- Factor pairs: 489 = 1 x 489 or 3 x 163
- 489 has no square factors that allow its square root to be simplified. √489 ≈ 22.113344
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