190 (number)
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190 is a natural number that follows 189 and precedes 191. It is an even composite number, meaning it has divisors other than 1 and itself.
In base ten, it consists of three digits: 1, 9, and 0. In Roman numerals it is written CXC.
Mathematical properties
190 can be decomposed by prime factorization as 2 × 5 × 19. Its divisors are 1, 2, 5, 10, 19, 38, 95, and 190—eight divisors in total. The sum of all divisors is 360.
190 is a triangular number. It is the sum of the integers from 1 to 19: 19 × 20 ÷ 2 = 190. It is also a hexagonal number, since 10 × (2×10 − 1) = 190. All hexagonal numbers are triangular numbers.
Because it is triangular, 190 represents the number of possible pairs that can be formed from a set of 20 objects (the binomial coefficient C(20,2) = 190).
Other uses
The number 190 appears in various numbering systems, such as road numbers, years in the Gregorian calendar (the year 190 CE), and counts of organization members. None of these applications changes the mathematical properties of the number.