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The Number 16391639 is a Nonagonal Number. 1639 is a Centered 18-gonal Number.
1639 is the number of binary rooted trees with 16 vertices.
The Year 1639 ADThere was a Venus Transit in 1631 AD and a partner transit in 1639 AD. In the year 1639 AD Stefano Landi, Italian composer died.1639 Melchior Franck, German composer died.
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