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Number

1,604

  • Positive
  • Even
  • Composite
  • 4 digits

1,604 is an even 4-digit integer and a composite number. It has 6 divisors and a digital root of 2.

Number properties

ParityEvendivisible by 2
SignPositive
PrimalityComposite
Absolute value1,604
Digit count4
Digit sum11
Digital root2repeated digit sum
PalindromicNoreads differently backwards
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum

Factors & divisors

Prime factorisation2^2 × 401
Distinct prime factors22, 401
Number of divisors6
Sum of divisors σ(n)2,814
Aliquot sum1,210sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)800integers below n that share no factor with it
SquarefreeNohas a repeated prime factor
All divisors1, 2, 4, 401, 802, 1,6046 in total

Arithmetic

Previous number1,603
Next number1,605
Double3,208
Half802
Square2,572,816
Cube4,126,796,864
Square root40.049968789≈irrational, shown to 9 decimal places
Cube root11.705809568≈
Negation-1,604
Reciprocal0.0006234414≈

Representations

Decimal1,604
Binary1100100010011 bits
Octal3104
Hexadecimal644
Base 3618K
Roman numeralMDCIV
In wordsone thousand, six hundred and four
Ordinalone thousand, six hundred and fourth
Scientific notation1.604 × 10^3
Engineering notation1.604 × 10^3

Nearest landmarks

Next prime1,607+3
Previous prime1,601−3
Distance to nearest prime3
Nearest square below1,600
Nearest square above1,681

Powers & multiples

1,604 to the power 22,572,816
1,604 to the power 34,126,796,864
1,604 to the power 46,619,382,169,856
1,604 to the power 510,617,489,000,449,024
First ten multiples1,604, 3,208, 4,812, 6,416, 8,020, 9,624, 11,228, 12,832, 14,436, 16,040
Powers of twoBetween 2^10 (1,024) and 2^11 (2,048)

Divisibility tests

Divisible by 2Yes
Divisible by 3No, remainder 2
Divisible by 4Yes
Divisible by 5No, remainder 4
Divisible by 6No, remainder 2
Divisible by 7No, remainder 1
Divisible by 8No, remainder 4
Divisible by 9No, remainder 2
Divisible by 10No, remainder 4
Divisible by 11No, remainder 9
Divisible by 12No, remainder 8
Divisible by 100No, remainder 4

Collatz (3n + 1) trajectory

Steps to reach 121the total stopping time
Highest value reached1,604
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps1,604 → 802 → 401 → 1,204 → 602 → 301 → 904 → 452 → 226 → 113 → …
Last steps… → 32 → 16 → 8 → 4 → 2 → 1

As a percentage & fraction

As a percentage160,400%
1,604% as a decimal16.04
1,604% of 1001,604
1,604% of 1,00016,040
As a fraction of 1001,604/100

Read another way

As seconds26 minutes and 44 seconds
As bytes1.566 KiB
As a year1604 AD
As a 24-bit colour#000644

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Neighbouring numbers

Nearby primes

Also reads as

1604 (year)

  • Leap year
  • 366 days
  • 17th century
  • Dragon

1604 was a leap year of 366 days. It began on a Thursday and ended on a Friday. Easter Sunday fell on 18 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 year53ISO 8601 weeks; 28 December is always in the final week
Days in February29
1 January fell on aThursday
31 December fell on aFriday
Century17th century
Decade1600s
Chinese zodiacDragon
Easter Sunday18 April

Months of 1604

January31 days, starts Thursday
February29 days, starts Sunday
March31 days, starts Monday
April30 days, starts Thursday
May31 days, starts Saturday
June30 days, starts Tuesday
July31 days, starts Thursday
August31 days, starts Sunday
September30 days, starts Wednesday
October31 days, starts Friday
November30 days, starts Monday
December31 days, starts Wednesday

Time references

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

Unix timestamp at the start-11,549,865,600
Unix timestamp at the end-11,518,243,201
Years from now422 years ago
Days from today154,384 days since 1 January

The number 1604

As a number1,604
In wordsone thousand, six hundred and four
Roman numeralsMDCIV

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Neighbouring years

Also reads as

#116600 (colour)

  • #116600
  • Green
  • Dark
  • Nearest: Dark green

#116600 is a green with RGB values 17, 102, 0 and HSL 110°, 100%, 20%. It is a dark colour, so white text on it reaches 7.2:1 contrast (AAA for normal text). The nearest named colour is Dark green.

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Colour values

#116600#116600
HEX#116600
HEX (short)#160
RGBrgb(17, 102, 0)
RGB (0–1)0.0667, 0.4, 0
RGB percentages6.7%, 40%, 0%
HSLhsl(110, 100%, 20%)
HSV / HSBhsv(110, 100%, 40%)
CMYK83.3%, 0%, 100%, 60%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,140,224
CSS custom property--colour: #116600;

Brightness & contrast

Relative luminance0.09622WCAG 2.x, 0 is black and 1 is white
Perceived brightness78.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 7.18:1
Contrast with white7.18:1WCAG normal text: AAA
Contrast with black2.92:1WCAG normal text: Fail
Greyscale equivalent#4D4D4D
Inverted#EE99FF

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#695B00no red cones; affects about 1% of men; ΔE 39 from the original
Deuteranopia#605511no green cones; the most common form, about 1% of men; ΔE 38.7 from the original
Tritanopia#006255no blue cones; rare, and affects men and women equally; ΔE 44.5 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text7.18:1WCAG large text: AAA
Contrast with black, large text2.92:1WCAG large text: Fail

Named colours

Dark green · ΔE 1.9Green · ΔE 15.1Forest green · ΔE 15.6Olivedrab · ΔE 23.3Dark olivegreen · ΔE 26.6Sea green · ΔE 26.9
Nearest named CSS colourDark green (#006400)ΔE 1.88, below the just-noticeable difference
Hue familygreen
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#550066
Analogous#446600, #006622
Triadic#001166, #660011
Split complementary#220066, #660044
Tetradic#004466, #550066, #662200

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#55FF33
Lighter +30%#2BFF00
Lighter +20%#22CC00
Lighter +10%#1A9900
Darker −10%#093300
Darker −20%#000000
Darker −30%#000000
Darker −40%#000000
More saturated +25%#116600
Less saturated −25%#1A590D

Channel breakdown

R17
G102
B0
Red17 (6.7%)
Green102 (40%)
Blue0 (0%)
Hue110°
Saturation (HSL)100%
Lightness20%
Dominant channelGreen
Hex per channelR 11 · G 66 · B 00

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Every value on this page was computed from “1604” by Nerdulator’s number engine. Nothing here was retrieved from a database of answers or written by a model.