פְּקֻדֵיהֶ֖ם לְמַטֵּ֣ה אֶפְרָ֑יִם אַרְבָּעִ֥ים אֶ֖לֶף וַחֲמֵ֥שׁ מֵאֽוֹת׃ (פ)
those that were numbered of them, of the tribe of Ephraim, were forty thousand and five hundred.
Read kabbalistic (mystical) interpretation of Numbers 1:33: and classical mystical sources.