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190 (number)

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

In mathematics[edit]

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.^[1] It is also a truncated square pyramid number.^[2]

Integers from 191 to 199[edit]

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.^[3][4]

There are 198 ridges on a U.S. dollar coin.^[5]

199

199 is a prime number and a centered triangular number.

In other fields[edit]

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

See also[edit]

Wikimedia Commons has media related to 190 (number).

• 190 (disambiguation)

References[edit]