To multiply the number 29384838338383638473738467383648834774838477437827473874848463748 by 40, you can perform the multiplication directly:
\[ 29384838338383638473738467383648834774838477437827473874848463748 \times 40 = 1175393533535345538949538695345953390993539097513098954993938549920 \]
Therefore, the result is:
\[ 1175393533535345538949538695345953390993539097513098954993938549920 \]