I made this puzzle with silver clues to look like a bell. I thought dark blue looked best as a background color with the silver numbers. The puzzle reminds me of a bell in the evening. For the fun of it, I googled Christmas Bells in the evening to see if any poems or songs came up.

Print the puzzles or type the solution in this excel file: 10-factors-986-992

I was very surprised that Google found a very old song called Christmas Bells at Eventide. I did not know that such a song existed. Eventide means the same thing as evening. You can listen to the song below.

This is my 989th post.

The number 989 is a palindrome in base 10. What about any other bases?

It’s 373 in BASE 17 because 3(17²) + 7(17) + 3(1) = 989,

252 in BASE 21 because 2(21²) + 5(21) + 2(1) = 989, and

1C1 in BASE 26 (C is 12 base 10) because 1(26²) + 12(26) + 1(1) = 989

- 989 is a composite number.
- Prime factorization: 989 = 23 × 43
- The exponents in the prime factorization are 1 and 1. Adding one to each and multiplying we get (1 + 1)(1 + 1) = 2 × 2 = 4. Therefore 989 has exactly 4 factors.
- Factors of 989: 1, 23, 43, 989
- Factor pairs: 989 = 1 × 989 or 23 × 43
- 989 has no square factors that allow its square root to be simplified. √989 ≈ 31.44837