9855
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Number
$9855$ (nine thousand, eight hundred and fifty-five) is:
- $3^3 \times 5 \times 73$
- The magic constant of a magic square of order $27$, after $1$, $(5)$, $15$, $34$, $\ldots$, $2465$, $2925$, $3439$, $4010$, $4641$, $5335$, $6095$, $6924$, $7825$, $8801$:
- $9855 = \ds \dfrac 1 {27} \sum_{k \mathop = 1}^{27^2} k = \dfrac {27 \paren {27^2 + 1} } 2$