190 (one hundred
ndninety) is the
natural number
In mathematics, the natural numbers are those numbers used for counting (as in "there are ''six'' coins on the table") and ordering (as in "this is the ''third'' largest city in the country").
Numbers used for counting are called '' cardinal ...
following
189 and preceding
191.
In mathematics
190 is a
triangular number, a
hexagonal number, and a
centered nonagonal number
A centered nonagonal number (or centered enneagonal number) is a centered figurate number that represents a nonagon with a dot in the center and all other dots surrounding the center dot in successive nonagonal layers. The centered nonagonal ...
, 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 = 2
6 × 3 is a 3-
smooth number, the smallest number with 14 divisors.
;193
:
193
Year 193 ( CXCIII) was a common year starting on Monday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Sosius and Ericius (or, less frequently, year 946 ''Ab urbe condit ...
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 representation
In mathematics, specifically in the representation theory of groups and algebras, an irreducible representation (\rho, V) or irrep of an algebraic structure A is a nonzero representation that has no proper nontrivial subrepresentation (\rho, _ ...
s 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 = 2
2 × 7
2 is a
square number
In mathematics, a square number or perfect square is an integer that is the square of an integer; in other words, it is the product of some integer with itself. For example, 9 is a square number, since it equals and can be written as .
The u ...
.
;197
:
197 is a prime number and a
Schröder–Hipparchus number.
;198
:198 = 2 × 3
2 × 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.
See also
*
190 (disambiguation) 190 A.D. is a year.
190 may also refer to:
* 190 (number), the natural number following 189 and preceding 191
* U.S. Route 190, also known as the Ronald Reagan Memorial Highway, is an east–west United States highway in Louisiana and Texas
* Mer ...
References
{{DEFAULTSORT:190 (Number)
Integers