Who directed the episode with 899000 viewers?
CREATE TABLE "table1_27547668_3" (
  "num" real,
  "no" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "viewers" real,
  "original_airdate" text,
  "prod_code" real
);
SELECT "directed_by" FROM "table1_27547668_3" WHERE "viewers"=899000;