440 (number)
440 is the natural number following 439 and preceding 441.
In mathematics
440 has the factorization440 is:
- Even
- The sum of the first 17 prime numbers
- A Harshad number
- An abundant number
- A happy number
In science
- A440 (pitch standard) widely used for the musical note A4, the A above Middle C, often used for tuning instruments