Number

1,428

Positive
Even
Composite
4 digits

1,428 is an even 4-digit integer and a composite number. It has 24 divisors and a digital root of 6.

Number properties

ParityEvendivisible by 2

SignPositive

PrimalityComposite

Absolute value1,428

Digit count4

Digit sum15

Digital root6repeated digit sum

PalindromicNoreads differently backwards

Happy numberNosquared-digit sums reach 1

Harshad numberNodivisible by its own digit sum

Factors & divisors

Prime factorisation2^2 × 3 × 7 × 17

Distinct prime factors42, 3, 7, 17

Number of divisors24

Sum of divisors σ(n)4,032

Aliquot sum2,604sum 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, 6, 7, 12, 14, 17, 21, 28, 34, 42, 51, 68, 84, 102, 119, 204, 238, 357, 476, 714, 1,42824 in total

Arithmetic

Previous number1,427

Next number1,429

Double2,856

Half714

Square2,039,184

Cube2,911,954,752

Square root37.788887255≈irrational, shown to 9 decimal places

Cube root11.26097694≈

Negation-1,428

Reciprocal0.0007002801≈

Representations

Decimal1,428

Binary1011001010011 bits

Octal2624

Hexadecimal594

Base 3613O

Roman numeralMCDXXVIII

In wordsone thousand, four hundred and twenty-eight

Ordinalone thousand, four hundred and twenty-eighth

Scientific notation1.428 × 10^3

Engineering notation1.428 × 10^3

Nearest landmarks

Next prime1,429+1

Previous prime1,427−1

Distance to nearest prime1

Nearest square below1,369

Nearest square above1,444

Powers & multiples

1,428 to the power 22,039,184

1,428 to the power 32,911,954,752

1,428 to the power 44,158,271,385,856

1,428 to the power 55,938,011,539,002,368

First ten multiples1,428, 2,856, 4,284, 5,712, 7,140, 8,568, 9,996, 11,424, 12,852, 14,280

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 5No, remainder 3

Divisible by 6Yes

Divisible by 7Yes

Divisible by 8No, remainder 4

Divisible by 9No, remainder 6

Divisible by 10No, remainder 8

Divisible by 11No, remainder 9

Divisible by 12Yes

Divisible by 100No, remainder 28

Collatz (3n + 1) trajectory

Steps to reach 134the total stopping time

Highest value reached1,428

Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven

First steps1,428 → 714 → 357 → 1,072 → 536 → 268 → 134 → 67 → 202 → 101 → …

Last steps… → 5 → 16 → 8 → 4 → 2 → 1

As a percentage & fraction

As a percentage142,800%

1,428% as a decimal14.28

1,428% of 1001,428

1,428% of 1,00014,280

As a fraction of 1001,428/100

Read another way

As seconds23 minutes and 48 seconds

As bytes1.395 KiB

As a year1428 AD

As a 24-bit colour#000594

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Neighbouring numbers

Derived from 1,428

Nearby primes

1428 (year)

Leap year
366 days
15th century
Monkey

1428 was a leap year of 366 days. It began on a Tuesday and ended on a Wednesday. Easter Sunday fell on 13 April.

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Structure of the year

Leap yearYesdivisible by 4, and by 400 if divisible by 100

Days in the year366

Weeks in the year52ISO 8601 weeks; 28 December is always in the final week

Days in February29

1 January fell on aTuesday

31 December fell on aWednesday

Century15th century

Decade1420s

Chinese zodiacMonkey

Easter Sunday13 April

Months of 1428

January31 days, starts Tuesday

February29 days, starts Friday

March31 days, starts Saturday

April30 days, starts Tuesday

May31 days, starts Thursday

June30 days, starts Sunday

July31 days, starts Tuesday

August31 days, starts Friday

September30 days, starts Monday

October31 days, starts Wednesday

November30 days, starts Saturday

December31 days, starts Monday

Time references

These values depend on today’s date and change daily.

Unix timestamp at the start-17,103,916,800

Unix timestamp at the end-17,072,294,401

Years from now598 years ago

Days from today218,668 days since 1 January

The number 1428

As a number1,428

In wordsone thousand, four hundred and twenty-eight

Roman numeralsMCDXXVIII

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Neighbouring years

Key dates

Also reads as

#114422 (colour)

#114422
Green
Dark
Nearest: Dark olivegreen

#114422 is a green with RGB values 17, 68, 34 and HSL 140°, 60%, 17%. It is a dark colour, so white text on it reaches 11.2:1 contrast (AAA for normal text). The nearest named colour is Dark olivegreen.

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Colour values

#114422#114422

HEX#114422

HEX (short)#142

RGBrgb(17, 68, 34)

RGB (0–1)0.0667, 0.2667, 0.1333

RGB percentages6.7%, 26.7%, 13.3%

HSLhsl(140, 60%, 16.7%)

HSV / HSBhsv(140, 75%, 26.7%)

CMYK75%, 0%, 50%, 73.3%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer1,131,554

CSS custom property--colour: #114422;

Brightness & contrast

Relative luminance0.04369WCAG 2.x, 0 is black and 1 is white

Perceived brightness54.2 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 11.21:1

Contrast with white11.21:1WCAG normal text: AAA

Contrast with black1.87:1WCAG normal text: Fail

Greyscale equivalent#373737

Inverted#EEBBDD

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#443E1Fno red cones; affects about 1% of men; ΔE 23.6 from the original

Deuteranopia#3E3924no green cones; the most common form, about 1% of men; ΔE 24.2 from the original

Tritanopia#00433Cno blue cones; rare, and affects men and women equally; ΔE 17.6 from the original

Distinguishable without hueYesnever rely on hue alone to carry meaning

Contrast with white, large text11.21:1WCAG large text: AAA

Contrast with black, large text1.87:1WCAG large text: Fail

Named colours

Dark olivegreen · ΔE 23.8 Dark slate grey · ΔE 24.9 Sea green · ΔE 30.4 Dark green · ΔE 33.5 Teal · ΔE 33.9 Dim grey · ΔE 36

Nearest named CSS colourDark olivegreen (#556B2F)ΔE 23.84, a distinctly different colour

Hue familygreen

CSS keyword usableNo exact keyword

Colour harmonies

base +30°+90°+120°+180°+210°+240°+270°+330°

Complementary#441133

Analogous#194411, #11443C

Triadic#221144, #442211

Split complementary#3B1144, #44111A

Tetradic#111944, #441133, #443B11

Tints, shades & saturation

+40%+30%+20%+10%base -10%-20%-30%-40%

Lighter +40%#4ED37A

Lighter +30%#30BE5F

Lighter +20%#25964B

Lighter +10%#1B6D36

Darker −10%#071B0E

Darker −20%#000000

Darker −30%#000000

Darker −40%#000000

More saturated +25%#064F1E

Less saturated −25%#1C3926

Channel breakdown

R17

G68

B34

Red17 (6.7%)

Green68 (26.7%)

Blue34 (13.3%)

Hue140°

Saturation (HSL)60%

Lightness16.67%

Dominant channelGreen

Hex per channelR 11 · G 44 · B 22

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1,428

Number properties

Factors & divisors

Arithmetic

Representations

Nearest landmarks

Powers & multiples

Divisibility tests

Collatz (3n + 1) trajectory

As a percentage & fraction

Read another way

Keep nerding

Neighbouring numbers

Derived from 1,428

Nearby primes

Other readings

1428 (year)

Structure of the year

Months of 1428

Time references

The number 1428

Keep nerding

Neighbouring years

Key dates

#114422 (colour)

Colour values

Brightness & contrast

Colour vision & accessibility

Named colours

Colour harmonies

Tints, shades & saturation

Channel breakdown

Keep nerding

Harmonies

Lighter and darker

Similar named colours

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