186 (number)

← 185 186 187 →
← 180 181 182 183 184 185 186 187 188 189 → List of numbers Integers ← 0 100 200 300 400 500 600 700 800 900 →
Cardinal	one hundred eighty-six
Ordinal	186th (one hundred eighty-sixth)
Factorization	2 × 3 × 31
Divisors	1, 2, 3, 6, 31, 62, 93, 186
Greek numeral	ΡΠϚ´
Roman numeral	CLXXXVI, clxxxvi
Binary	101110102
Ternary	202203
Senary	5106
Octal	2728
Duodecimal	13612
Hexadecimal	BA16

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. ^[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]}

186 is a Fine number. ^[4]

See also

• All pages with titles containing 186

References

1. Sloane, N. J. A. (ed.). "SequenceA058763(Integers which are neither totient nor cototient)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
2. Sloane, N. J. A. (ed.). "SequenceA001207(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. ISBN   978-1-4832-3187-7. MR   0337670.
4. Sloane, N. J. A. (ed.). "SequenceA000957". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2022-06-01.