190 (number)

190 (one hundred [and] ninety) is the natural number following 189 and preceding 191.

In mathematics
190 is a triangular number, a hexagonal number, and a centered nonagonal number, the fourth figurate number (after 1, 28, and 91) with that combination of properties. It is also a truncated square pyramid number.

Integers from 191 to 199

 * 191
 * 191 is a prime number.


 * 192
 * 192 = 26 × 3 is a 3-smooth number, the smallest number with 14 divisors.


 * 193
 * 193 is a prime number.


 * 194
 * 194 = 2 × 97 is a Markov number, the smallest number written as the sum of three squares in five ways, and the number of irreducible representations of the Monster group.


 * 195
 * 195 = 3 × 5 × 13 is the smallest number expressed as a sum of distinct squares in 16 different ways.


 * 196
 * 196 = 22 × 72 is a square number.


 * 197
 * 197 is a prime number and a Schröder–Hipparchus number.


 * 198
 * 198 = 2 × 32 × 11 is the smallest number written as the sum of four squares in ten ways.
 * No integer factorial ever ends in exactly 198 zeroes in base 10 or in base 12.
 * There are 198 ridges on a U.S. dollar coin.


 * 199
 * 199 is a prime number and a centered triangular number.

In other fields

 * 190 is the telephonic number of the 27 Brazilian Military Polices.