186 = 2 x 3 x 31.
186 is the maximum number of regions into which 9 spheres divide space.
7 x 5 x 3 x 2 - 4 x 3 x 2 x 1 = 186.
186 x 39 = 7254 uses each of the nine digits 1-9 once.
186 is 1221 in base 5 and 272 in base 8.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgFd7DbiT2Ou5GrcG8n-Uod_kgv7DkjMMIlPmXDI8cbrNldy2m_kob_VXYkpUoA9YrFZdkt6qN-XdwkIFmbdJi5OkeuETCsLI94NCf91NDOTmx9UKuchyphenhyphenTM7yQLqakYLurJqbi3eurpknc/s200/n0186.jpg)
186 is the number of odd days in a year that is not a leap year.
Source: Number Gossip