190 (number)
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190 is the natural number following one hundred eighty-nine and preceding one hundred ninety-one.
| Template:Numbers 100-200 | |
| Ordinal | One hundred [and] ninety |
| Cardinal | 190th |
| Factorization | <math>2 \cdot 5 \cdot 19<math> |
| Roman numeral | CXC |
| Binary | 10111110 |
| Hexadecimal | BE |
One hundred ninety is a sphenic number and a Harshad number. It is a triangular number, a hexagonal number and a centered nonagonal number.
One hundred ninety is also
- The designation of some spur routes of Interstate 90.
- For the year, see 190 AD.
190 is a pseudonym used by musician Naoki Maeda.
190 is the emergency number for Brazil.
Other numbers in the 190s
191 = prime number, Sophie Germain prime, Thabit number, palindromic prime, permutable prime
192 = 2^6 3, sum of ten consecutive primes (5 + 7 + 11 + 13 + 17 + 19 + 23 + 29 + 31 + 37), Harshad number
193 = prime number, only known odd prime n for which 2 is not a primitive root of 4n2 + 1.
194 = 2 97, nontotient
195 = 3 5 13, sphenic number, sum of eleven consecutive primes (3 + 5 + 7 + 11 + 13 + 17 + 19 + 23 + 29 + 31 + 37), one of the few odd numbers to be surrounded on both sides by twin primes, Harshad number
196 has its own article.
197 = prime number, sum of the first twelve primes, sum of seven consecutive primes (17 + 19 + 23 + 29 + 31 + 37 + 41), centered heptagonal number, Keith number, Mertens function(197) = -7 a record low
198 = 2 3^2 11, Harshad number, self number
199 = prime number, sum of three consecutive primes (61 + 67 + 71), sum of five consecutive primes (31 + 37 + 41 + 43 + 47), Lucas number, Mertens function(199) = -8 a record low, centered triangular number
ko:190