254 (number)

Some of this article's listed sources may not be reliable. Please help this article by looking for better, more reliable sources. Unreliable citations may be challenged or deleted. (July 2021) (Learn how and when to remove this template message)

254 (two hundred [and] fifty-four) is the natural number following 253 and preceding 255.

In mathematics[]

• It is an even number.^{[1][better source needed]}
• Is a composite number with four divisors: 1, 2, 127 and 254.^{[1][2][better source needed]} Since the sum of its divisors (excluding the same number) is 130 < 254, is a deficient number.^{[2][better source needed]}
• It is a semiprime number.^[3][1][2] Moreover, in American English, its name has a semiprime number of syllables.^[3]
• It is a square-free integer.^[4]
• It is a number nontotient.^[5]

• It is the maximum number of regions in which a plane can be divided by 22 lines.^{[6][verification needed]}
• It is a congruent number.^[4]

In other fields[]

• 254 nm is one of the wavelengths emitted by a mercury-vapor lamp.^{[7][8][verification needed]}

References[]