CREATE TABLE table_2345558_1 (_number INT, us_viewers__millions_ VARCHAR)

What is the number of the episode seen by 1.370 million people in the US?
SELECT MAX(_number) FROM table_2345558_1 WHERE us_viewers__millions_ = "1.370"
SELECT MAX("_number") FROM "table_2345558_1" WHERE "1.370" = "us_viewers__millions_"