819:2

$$19 \div 2\frac{3}{8} = \frac{19}{1} \div \frac{19}{8} = \frac{19}{1} \times \frac{8}{19} = \frac{19 \times 8}{1 \times 19} = \frac{152}{19} = 8$$.

Ответ: $$8$$