190 (number)

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

List of numbers -- Integers << 100 110 120 130 140 150 160 170 180 190 >>
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 and a hexagonal number.

One hundred ninety is also

• The designation of some spur routes of Interstate 90.
• For the year, see 190 AD.

Other numbers in the 190s

191 = prime number, palindromic prime, permutable prime

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192 = 2^6 3, sum of ten consecutive primes (5 + 7 + 11 + 13 + 17 + 19 + 23 + 29 + 31 + 37), Harshad number

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193 = prime number, only known odd prime n for which 2 is not a primitive root of 4n² + 1.

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194 = 2 97, nontotient

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195 = 3 5 13, sphenic number, one of the few odd numbers to be surrounded on both sides by twin primes, Harshad number

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196 has its own article.

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197 = prime number, sum of the first twelve primes, sum of seven consecutive primes (17 + 19 + 23 + 29 + 31 + 37 + 41), sum of eleven consecutive primes (3 + 5 + 7 + 11 + 13 + 17 + 19 + 23 + 29 + 31 + 37), Keith number, Mertens function(197) = -7 a record low

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198 = 2 3^2 11, Harshad number, self number

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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

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