Number
1,990
- Positive
- Even
- Composite
- 4 digits
1,990 is an even 4-digit integer and a composite number. It has 8 divisors and a digital root of 1.
Number properties
ParityEvendivisible by 2
SignPositive
PrimalityComposite
Absolute value1,990
Digit count4
Digit sum19
Digital root1repeated digit sum
PalindromicNoreads differently backwards
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation2 × 5 × 199
Distinct prime factors32, 5, 199
Number of divisors8
Sum of divisors σ(n)3,600
Aliquot sum1,610sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)792integers below n that share no factor with it
SquarefreeYesno repeated prime factor
All divisors1, 2, 5, 10, 199, 398, 995, 1,9908 in total
Arithmetic
Representations
Decimal1,990
Binary1111100011011 bits
Octal3706
Hexadecimal7C6
Base 361JA
Roman numeralMCMXC
In wordsone thousand, nine hundred and ninety
Ordinalone thousand, nine hundred and ninetieth
Scientific notation1.99 × 10^3
Engineering notation1.99 × 10^3
Nearest landmarks
Powers & multiples
1,990 to the power 23,960,100
1,990 to the power 37,880,599,000
1,990 to the power 415,682,392,010,000
1,990 to the power 531,207,960,099,900,000
First ten multiples1,990, 3,980, 5,970, 7,960, 9,950, 11,940, 13,930, 15,920, 17,910, 19,900
Powers of twoBetween 2^10 (1,024) and 2^11 (2,048)
Divisibility tests
Divisible by 2Yes
Divisible by 3No, remainder 1
Divisible by 4No, remainder 2
Divisible by 5Yes
Divisible by 6No, remainder 4
Divisible by 7No, remainder 2
Divisible by 8No, remainder 6
Divisible by 9No, remainder 1
Divisible by 10Yes
Divisible by 11No, remainder 10
Divisible by 12No, remainder 10
Divisible by 100No, remainder 90
Collatz (3n + 1) trajectory
Steps to reach 124the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps1,990 → 995 → 2,986 → 1,493 → 4,480 → 2,240 → 1,120 → 560 → 280 → 140 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage199,000%
1,990% as a decimal19.9
1,990% of 1001,990
1,990% of 1,00019,900
As a fraction of 1001,990/100
Read another way
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Derived from 1,990
Also reads as
1990 (year)
- Common year
- 365 days
- 20th century
- Horse
1990 was a common year of 365 days. It began on a Monday and ended on a Monday. Easter Sunday fell on 15 April.
Structure of the year
Months of 1990
January31 days, starts Monday
February28 days, starts Thursday
September30 days, starts Saturday
October31 days, starts Monday
November30 days, starts Thursday
December31 days, starts Saturday
Time references
These values depend on today’s date and change daily.
Unix timestamp at the start631,152,000
Unix timestamp at the end662,687,999
Years from now36 years ago
Days from today13,400 days since 1 January
The number 1990
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Also reads as
#119999 (colour)
- #119999
- Cyan
- Dark
- Nearest: Dark cyan
#119999 is a cyan with RGB values 17, 153, 153 and HSL 180°, 80%, 33%. It is a dark colour, so black text on it reaches 6:1 contrast (AA for normal text). The nearest named colour is Dark cyan.
Colour values
#119999#119999
HEX#119999
HEX (short)#199
RGBrgb(17, 153, 153)
RGB (0–1)0.0667, 0.6, 0.6
RGB percentages6.7%, 60%, 60%
HSLhsl(180, 80%, 33.3%)
HSV / HSBhsv(180, 88.9%, 60%)
CMYK88.9%, 0%, 0%, 40%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,153,433
CSS custom property--colour: #119999;
Brightness & contrast
Relative luminance0.25202WCAG 2.x, 0 is black and 1 is white
Perceived brightness128.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 6.04:1
Contrast with white3.48:1WCAG normal text: Fail
Contrast with black6.04:1WCAG normal text: AA
Greyscale equivalent#7C7C7C
Inverted#EE6666
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text3.48:1WCAG large text: AA
Contrast with black, large text6.04:1WCAG large text: AAA
Named colours
Hue familycyan
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#991111
Analogous#119955, #115599
Triadic#991199, #999911
Split complementary#991155, #995511
Tetradic#551199, #991111, #559911
Tints, shades & saturation
Channel breakdown
R17
G153
B153
Red17 (6.7%)
Green153 (60%)
Blue153 (60%)
Hue180°
Saturation (HSL)80%
Lightness33.33%
Dominant channelGreen and Blue
Hex per channelR 11 · G 99 · B 99
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