49. As shown in the figure, natural numbers starting from 1 are arranged in Pascal's Triangle. The number 2019 is located in the $\qquad$th row and the $\qquad$th position.
$$
\begin{array}{l}
1 \\
23 \\
\begin{array}{lll}
4 \quad 5 \quad 6
\end{array} \\
\begin{array}{llll}
7 & 8 & 9 & 10
\end{array} \\
11 \quad 12 \quad 13 \quad 1415 \\
\end{array}
$$
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