よんひゃく ４００ Common word Wanikani level 4 LinksSentence search for ４００Sentence search for よんひゃくSentence search for 四百Sentence search for ４百Sentence search for 四〇〇Edit in JMdict Numeric1. 400; four hundredOther forms四百 【よんひゃく】、４百 【よんひゃく】、四〇〇 【よんひゃく】 Discussions Log in to talk about this word.