$$2/987\div430$$
$\frac{1}{212205}\approx 0.000004712$
$$\frac{2}{987\times 430}$$
$$\frac{2}{424410}$$
$$\frac{1}{212205}$$
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$\frac{1}{3 \cdot 5 \cdot 7 \cdot 43 \cdot 47} = 4.712424306684574 \times 10^{-6}$