186 (number)

186 (one hundred [and] eighty-six) is the natural number following 185 and preceding 187.

← 185 186 187 →
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Cardinalone hundred eighty-six
Ordinal186th
(one hundred eighty-sixth)
Factorization2 × 3 × 31
Greek numeralΡΠϚ´
Roman numeralCLXXXVI
Binary101110102
Ternary202203
Octal2728
Duodecimal13612
HexadecimalBA16

In mathematics

There is no integer with exactly 186 coprimes less than it, so 186 is a nontotient. It is also never the difference between an integer and the total of coprimes below it, so it is a noncototient.[1]

There are 186 different pentahexes, shapes formed by gluing together five regular hexagons, when rotations of shapes are counted as distinct from each other.[2][3]

See also

References
  1. Sloane, N. J. A. (ed.). "Sequence A058763 (Integers which are neither totient nor cototient)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  2. Sloane, N. J. A. (ed.). "Sequence A001207 (Number of fixed hexagonal polyominoes with n cells)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  3. Lunnon, W. F. (1972). "Counting hexagonal and triangular polyominoes". In Read, Ronald C. (ed.). Graph Theory and Computing. Academic Press. pp. 87–100. doi:10.1016/B978-1-4832-3187-7.50013-1. MR 0337670.
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