Number

290

290 is a composite number, even, a calendar year.

290 (two hundred ninety) is an even 3-digit number. It is a composite number with 8 divisors, and factors as 2 × 5 × 29. Written other ways, in Roman numerals it is CCXC and in binary, 100100010.

Cube-Free Deficient Number Odious Number Pernicious Number Recamán's Sequence Sphenic Number Squarefree Year

Interestingness

★ ★ ☆ ☆ ☆

4 notable facts · grade D

278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302

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Historical context — 290 AD

Calendar year

Year 290 (CCXC) was a common year starting on Wednesday of the Julian calendar.

Excerpt from Wikipedia (en) ↗ · Licensed CC BY-SA 4.0 Read the full article on Wikipedia →

Historical context — 290 BC

Calendar year

Year 290 BC was a year of the pre-Julian Roman calendar.

Excerpt from Wikipedia (en) ↗ · Licensed CC BY-SA 4.0 Read the full article on Wikipedia →

Year facts

Year type: Common year
Standard 365-day year; not divisible by 4 (or divisible by 100 but not 400).
Days in year: 365
ISO weeks: 52
Started on: Wednesday
January 1, 290
Ended on: Wednesday
December 31, 290
Friday the 13ths: 1
One Friday the 13th this year.
Decade: 290s
290–299
Century: 3rd century
201–300
Millennium: 1st millennium
1–1000
Years ago: 1,736
1736 years before 2026.

In other calendars

Hebrew: 4050 / 4051 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Metal zodiac:Dog
Sexagenary cycle position 47 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 833 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 282 / 283 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 212 / 211 Saka
Indian national calendar; year starts in March.

Properties

Parity: Even
Digit count: 3
Digit sum: 11
Digit product: 0
Digital root: 2
Palindrome: No
Bit width: 9 bits
Reversed: 92
Recamán's sequence: a(668) = 290
Square (n²): 84,100
Cube (n³): 24,389,000
Divisor count: 8
σ(n) — sum of divisors: 540
φ(n) — Euler's totient: 112
Sum of prime factors: 36

Primality

Prime factorization: 2 × 5 × 29

Nearest primes: 283 (−7) · 293 (+3)

Divisors & multiples

All divisors (8)

1 · 2 · 5 · 10 · 29 · 58 · 145 (half) · 290

Aliquot sum (sum of proper divisors): 250

Factor pairs (a × b = 290)

1 × 290

2 × 145

5 × 58

10 × 29

First multiples

290 · 580 (double) · 870 · 1,160 · 1,450 · 1,740 · 2,030 · 2,320 · 2,610 · 2,900

Sums & aliquot sequence

As a sum of two squares: 1² + 17² = 11² + 13²

As consecutive integers: 71 + 72 + 73 + 74 56 + 57 + 58 + 59 + 60 5 + 6 + … + 24

Aliquot sequence: 290 → 250 → 218 → 112 → 136 → 134 → 70 → 74 → 40 → 50 → 43 → 1 → 0 — terminates at zero

Continued fraction of √n

√290 = [17; (34)]

Period length 1 — the block in parentheses repeats forever.

Representations

In words: two hundred ninety
Ordinal: 290th
Roman numeral: CCXC
Binary: 100100010
Octal: 442
Hexadecimal: 0x122
Base64: ASI=
One's complement: 65,245 (16-bit)
Scientific notation: 2.9 × 10²
As a duration: 290 s = 4 minutes, 50 seconds

In other bases

ternary (3) 101202

quaternary (4) 10202

quinary (5) 2130

senary (6) 1202

septenary (7) 563

nonary (9) 352

undecimal (11) 244

duodecimal (12) 202

tridecimal (13) 194

tetradecimal (14) 16a

pentadecimal (15) 145

Palindromic in base 12

As an angle

290°

290° ≈ 5.061 rad

Compass bearing: WNW (west-northwest)

Why does a circle have 360 degrees? →

Historical numeral systems

Babylonian (base 60): 𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋
Egyptian hieroglyphic: 𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆
Greek (Milesian): σϟʹ
Mayan (base 20): 𝋮·𝋪
Chinese: 二百九十
Chinese (financial): 貳佰玖拾

In other modern scripts

Eastern Arabic ٢٩٠ Devanagari २९० Bengali ২৯০ Tamil ௨௯௦ Thai ๒๙๐ Tibetan ༢༩༠ Khmer ២៩០ Lao ໒໙໐ Burmese ၂၉၀

Digit at this position in famous constants

π — Pi (π): Digit 290 = 2
e — Euler's number (e): Digit 290 = 0
φ — Golden ratio (φ): Digit 290 = 2
√2 — Pythagoras's (√2): Digit 290 = 9
ln 2 — Natural log of 2: Digit 290 = 8
γ — Euler-Mascheroni (γ): Digit 290 = 6

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 290, here are decompositions:

7 + 283 = 290
13 + 277 = 290
19 + 271 = 290
61 + 229 = 290
67 + 223 = 290
79 + 211 = 290
97 + 193 = 290
109 + 181 = 290

Showing the first eight; more decompositions exist.

Unicode codepoint

Latin Capital Letter G With Cedilla

U+0122

Uppercase letter (Lu)

UTF-8 encoding: C4 A2 (2 bytes).

Lookup U+0122 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#000122

RGB(0, 1, 34)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.1.34.

Address: 0.0.1.34
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.1.34

Unspecified address (0.0.0.0/8) — "this network" placeholder.

Musical pitch

Heard as a frequency, 290 Hz is closest to:

Concert pitch (A4 = 440 Hz): D4 (293.7 Hz, -22¢)
Scientific pitch (C4 = 256 Hz): D4 (287.4 Hz, +16¢)
Baroque pitch (A4 = 415 Hz): D♯4 (293.4 Hz, -20¢)

Food additive (E-number)

On an ingredients label, E290 is Carbon dioxide, a preservative — the fizz in carbonated drinks.

E-number reference (Wikipedia) ↗