From Wikipedia, the free encyclopedia
Natural 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.
[1] It is also a
truncated square pyramid number.
[2]
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.
[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
See also
References
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100,000
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1,000,000
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10,000,000
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100,000,000
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1,000,000,000
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