According to the search results, 40,000 Japanese yen is worth approximately 268.66 US dollars. However, other sources provide slightly different values, such as 270.826028 US dollars or 269.59269094 US dollars. The exact exchange rate may vary depending on the time and place of the conversion, as well as the method used for the transfer. It is recommended to check with a reliable currency converter or financial institution for the most up-to-date and accurate exchange rate.