אֵ֖לֶּה מִשְׁפְּחֹ֣ת הָרֻֽאוּבֵנִ֑י וַיִּהְי֣וּ פְקֻדֵיהֶ֗ם שְׁלֹשָׁ֤ה וְאַרְבָּעִים֙ אֶ֔לֶף וּשְׁבַ֥ע מֵא֖וֹת וּשְׁלֹשִֽׁים׃
These are the families of the Reubenites; and they that were numbered of them were forty and three thousand and seven hundred and thirty.
Read kabbalistic (mystical) interpretation of Numbers 26:7: and classical mystical sources.