39 is ...
the atomic number of Yttrium.
the number of activities prohibited on Shabbat, according to Halakha.
the number of defining statements of Anglican Church doctrine, and the number of books in the Old Testament (in the Protestant canon).
a semiprime (the product of two primes, 3 and 13), the sum of five consecutive primes (3 + 5 + 7 + 11
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