Number
1,440
- Positive
- Even
- Composite
- 4 digits
1,440 is an even 4-digit integer and a composite number. It has 36 divisors and a digital root of 9.
Number properties
ParityEvendivisible by 2
SignPositive
PrimalityComposite
Absolute value1,440
Digit count4
Digit sum9
Digital root9repeated digit sum
PalindromicNoreads differently backwards
Happy numberNosquared-digit sums reach 1
Harshad numberYesdivisible by its own digit sum
Factors & divisors
Prime factorisation2^5 × 3^2 × 5
Distinct prime factors32, 3, 5
Number of divisors36
Sum of divisors σ(n)4,914
Aliquot sum3,474sum of the proper divisors
ClassificationAbundantthe aliquot sum exceeds the number
Euler's totient φ(n)384integers below n that share no factor with it
SquarefreeNohas a repeated prime factor
All divisors1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 18, 20, 24, 30, 32, 36, 40, 45, 48, 60, 72, 80, 90, 96, 120, 144, 160, 180, 240, 288, 360, 480, 720, 1,44036 in total
Arithmetic
Representations
Decimal1,440
Binary1011010000011 bits
Octal2640
Hexadecimal5A0
Base 36140
Roman numeralMCDXL
In wordsone thousand, four hundred and forty
Ordinalone thousand, four hundred and fortieth
Scientific notation1.44 × 10^3
Engineering notation1.44 × 10^3
Nearest landmarks
Powers & multiples
1,440 to the power 22,073,600
1,440 to the power 32,985,984,000
1,440 to the power 44,299,816,960,000
1,440 to the power 56,191,736,422,400,000
First ten multiples1,440, 2,880, 4,320, 5,760, 7,200, 8,640, 10,080, 11,520, 12,960, 14,400
Powers of twoBetween 2^10 (1,024) and 2^11 (2,048)
Divisibility tests
Divisible by 2Yes
Divisible by 3Yes
Divisible by 4Yes
Divisible by 5Yes
Divisible by 6Yes
Divisible by 7No, remainder 5
Divisible by 8Yes
Divisible by 9Yes
Divisible by 10Yes
Divisible by 11No, remainder 10
Divisible by 12Yes
Divisible by 100No, remainder 40
Collatz (3n + 1) trajectory
Steps to reach 121the total stopping time
Highest value reached1,440
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps1,440 → 720 → 360 → 180 → 90 → 45 → 136 → 68 → 34 → 17 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage144,000%
1,440% as a decimal14.4
1,440% of 1001,440
1,440% of 1,00014,400
As a fraction of 1001,440/100
Read another way
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Derived from 1,440
Also reads as
1440 (year)
- Leap year
- 366 days
- 15th century
- Monkey
1440 was a leap year of 366 days. It began on a Wednesday and ended on a Thursday. Easter Sunday fell on 29 March.
Structure of the year
Months of 1440
January31 days, starts Wednesday
February29 days, starts Saturday
August31 days, starts Saturday
September30 days, starts Tuesday
October31 days, starts Thursday
November30 days, starts Sunday
December31 days, starts Tuesday
Time references
These values depend on today’s date and change daily.
Unix timestamp at the start-16,725,225,600
Unix timestamp at the end-16,693,603,201
Years from now586 years ago
Days from today214,284 days since 1 January
The number 1440
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Also reads as
#114444 (colour)
- #114444
- Cyan
- Dark
- Nearest: Dark slate grey
#114444 is a cyan with RGB values 17, 68, 68 and HSL 180°, 60%, 17%. It is a dark colour, so white text on it reaches 10.9:1 contrast (AAA for normal text). The nearest named colour is Dark slate grey.
Colour values
#114444#114444
HEX#114444
HEX (short)#144
RGBrgb(17, 68, 68)
RGB (0–1)0.0667, 0.2667, 0.2667
RGB percentages6.7%, 26.7%, 26.7%
HSLhsl(180, 60%, 16.7%)
HSV / HSBhsv(180, 75%, 26.7%)
CMYK75%, 0%, 0%, 73.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,131,588
CSS custom property--colour: #114444;
Brightness & contrast
Relative luminance0.04671WCAG 2.x, 0 is black and 1 is white
Perceived brightness57.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.86:1
Contrast with white10.86:1WCAG normal text: AAA
Contrast with black1.93:1WCAG normal text: Fail
Greyscale equivalent#393939
Inverted#EEBBBB
Colour vision & accessibility
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text10.86:1WCAG large text: AAA
Contrast with black, large text1.93:1WCAG large text: Fail
Named colours
Hue familycyan
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#441111
Analogous#11442A, #112A44
Triadic#441144, #444411
Split complementary#44112A, #442A11
Tetradic#2A1144, #441111, #2A4411
Tints, shades & saturation
Channel breakdown
R17
G68
B68
Red17 (6.7%)
Green68 (26.7%)
Blue68 (26.7%)
Hue180°
Saturation (HSL)60%
Lightness16.67%
Dominant channelGreen and Blue
Hex per channelR 11 · G 44 · B 44
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