189

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Number

$189$ (one hundred and eighty-nine) is:

$3^3 \times 7$

The $9$th heptagonal number after $1$, $7$, $18$, $34$, $55$, $81$, $112$, $148$:

$189 = 1 + 7 + 11 + 16 + 21 + 26 + 31 + 36 + 41 = \dfrac {9 \left({5 \times 9 - 3}\right)} 2$

The $36$th lucky number:

$1$, $3$, $7$, $9$, $13$, $15$, $21$, $\ldots$, $133$, $135$, $141$, $151$, $159$, $163$, $169$, $171$, $189$, $\ldots$

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