290 (number)
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290 is a natural number that lies between 289 and 291. It is a composite number, meaning it has divisors other than 1 and itself. In base 10, it is composed of three digits: 2, 9, and 0.
290 is divisible by 2, and is therefore even. It ends in 0, which means it is divisible by both 5 and 10. These simple properties make it a standard example used in elementary mathematics instruction on division and factors.
Mathematical properties
The prime factorization of 290 is 2 × 5 × 29. The three prime factors are distinct, making 290 squarefree—no perfect square greater than 1 divides it evenly. Its complete set of divisors is 1, 2, 5, 10, 29, 58, 145, and 290.
290 can be expressed as a sum of two squares: 290 = 17² + 1² and also 290 = 13² + 11². This is connected to the fact that its odd prime factors (5 and 29) each leave remainder 1 when divided by 4, which permits more than one such representation.
General use
Like other three-digit numbers, 290 commonly appears in historical contexts (the year 290 in the common era and 290 years before the common era), road numbers, postal codes, and serials. These uses are purely nominal and have no particular mathematical significance.