What is the lowest episode number that had 4.03 million viewers?
CREATE TABLE "table1_27927185_1" (
  "episode_num" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "originalairdate" text,
  "viewers_millions" text
);
SELECT MIN("episode_num") FROM "table1_27927185_1" WHERE "viewers_millions"='4.03';