CREATE TABLE table_23390604_1 (mohsen_rezaee INT, mir_hossein_mousavi VARCHAR)

What is the highest score for candidate Mohsen Rezaee when candidate mir-hossein mousavi scored 837858 votes?
SELECT MAX(mohsen_rezaee) FROM table_23390604_1 WHERE mir_hossein_mousavi = 837858
SELECT MAX("mohsen_rezaee") FROM "table_23390604_1" WHERE "mir_hossein_mousavi" = 837858