440 (number)

This article is about the number. For other uses, see 440 (disambiguation).

440 (four hundred [and] forty) is the natural number following 439 and preceding 441.

← 439 440 441 →
List of numbers Integers ← 0 100 200 300 400 500 600 700 800 900 →
Cardinal	four hundred forty
Ordinal	440th (four hundred fortieth)
Factorization	23 × 5 × 11
Divisors	1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 55, 88, 110, 220, 440
Greek numeral	ΥΜ´
Roman numeral	CDXL, cdxl
Binary	1101110002
Ternary	1210223
Senary	20126
Octal	6708
Duodecimal	30812
Hexadecimal	1B816
Hebrew	מת (Tav)(Mem)

In mathematics

440 has the factorization 2³ · 5 · 11.

440 is:

• Even
• The sum of the first 17 prime numbers
• A Harshad number
• An abundant number^[1]
• A happy number^[2]

In science

• A440 (pitch standard) widely used for the musical note A4, the A above Middle C, often used for tuning instruments