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207 (number)

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Natural number

207

← 200 201 202 203 204 205 206 207 208 209 →

← 0 100 200 300 400 500 600 700 800 900 →

two hundred seven

207th
(two hundred seventh)

3 × 23

1, 3, 9, 23, 69, 207

ΣΖ´

CCVII, ccvii

11001111₂

21200₃

543₆

317₈

153₁₂

CF₁₆

207 (two hundred seven) is the natural number following 206 and preceding 208. It is an odd composite number with a prime factorization of $3^{2}\cdot 23$ .

In Mathematics

207 is a Wedderburn-Etherington number.

There are exactly 207 different matchstick graphs with eight edges.

207 is a deficient number, as 207's proper divisors (divisors not including the number itself) only add up to 105: $1+3+9+23+69=105<207$ .

References

Sloane, N. J. A. (ed.). "Sequence A001190 (Wedderburn-Etherington numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
Sloane, N. J. A. (ed.). "Sequence A066951 (Number of nonisomorphic connected graphs that can be drawn in the plane using n unit-length edges)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
Salvia, Raffaele (2013). "A catalog for matchstick graphs". arXiv:1303.5965 .

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750 751 752 753 754 755 756 757 758 759
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