190 (number) - Definition and Overview

190 is the natural number following one hundred eighty-nine and preceding one hundred ninety-one.

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.

Other numbers in the 190s

191 = prime number, Sophie Germain prime, 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