254 (number)

In mathematics

• It is an even number.
• Is a composite number with four divisors: 1, 2, 127 and 254. Since the sum of its divisors is 130 < 254, is a deficient number.
• It is a semiprime number.
• It is a square-free integer.
• It is a number nontotient.
• It is the maximum number of regions in which a plane can be divided by 22 lines.
• It is a congruent number.

  In other fields

• 254 nm is one of the wavelengths emitted by a mercury-vapor lamp