This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
噃 combines 口 (mouth) with 番, but the exact historical development is uncertain. It may have originally been a phono-semantic compound related to speech or sound, but this is speculative.
A mouth 口 beside 番, but the meaning is unclear. Perhaps it once described a kind of vocal sound or chant.
For ハン, imagine a half-heard voice coming from the mouth 口: half -> ハン, but the sound is indistinct.