The FromDigits command returns an integer created using a specified list of decimal digits.

$\mathrm{with}\left(\mathrm{MmaTranslator}\left[\mathrm{Mma}\right]\right)\:$

$\mathrm{FromDigits}\left(\left[4\,6\,3\,8\right]\right)$

$4638$

$\mathrm{with}\left(\mathrm{MmaTranslator}\right)\:$

$\mathrm{FromMma}\left(\mathrm{`FromDigits[\{4,\; 6,\; 3,\; 8\}]`}\,\mathrm{evaluate}\right)$

$4638$