186 (number) explained

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

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.

There are 186 different pentahexes, shapes formed by gluing together five regular hexagons, when rotations of shapes are counted as distinct from each other.^[1]

186 is a Fine number.^[2]

See also

• The year AD 186 or 186 BC
• List of highways numbered 186

Notes and References

1. Book: Lunnon, W. F. . Read . Ronald C. . Counting hexagonal and triangular polyominoes . 10.1016/B978-1-4832-3187-7.50013-1 . 0337670 . 87–100 . Academic Press . Graph Theory and Computing . 1972. 978-1-4832-3187-7 .
2. 1 on an n-set; also number of ordered rooted trees with n edges having root of even degree. 2022-06-01.