Number

340

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

Abundant Number Arithmetic Number Evil Number Practical Number Recamán's Sequence Semiperfect Number Year

Historical context — 340 AD

Calendar year

Year 340 (CCCXL) was a leap year starting on Tuesday of the Julian calendar.

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Historical context — 340 BC

Calendar year

Year 340 BC was a year of the pre-Julian Roman calendar.

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Year facts

Year type: Leap year
Divisible by 4 and not by 100; February has 29 days.
Days in year: 366
ISO weeks: 52
Started on: Monday
January 1, 340
Ended on: Tuesday
December 31, 340
Friday the 13ths: 2
2 Friday the 13ths this year.
Decade: 340s
340–349
Century: 4th century
301–400
Millennium: 1st millennium
1–1000
Years ago: 1,686
1686 years before 2026.

In other calendars

Hebrew: 4100 / 4101 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Metal zodiac:Rat
Sexagenary cycle position 37 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 883 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 332 / 333 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 262 / 261 Saka
Indian national calendar; year starts in March.

Properties

Parity: Even
Digit count: 3
Digit sum: 7
Digit product: 0
Digital root: 7
Palindrome: No
Bit width: 9 bits
Reversed: 43
Recamán's sequence: a(568) = 340
Square (n²): 115,600
Cube (n³): 39,304,000
Divisor count: 12
σ(n) — sum of divisors: 756
φ(n) — Euler's totient: 128
Sum of prime factors: 26

Primality

Prime factorization: 2 ² × 5 × 17

Nearest primes: 337 (−3) · 347 (+7)

Divisors & multiples

All divisors (12)

1 · 2 · 4 · 5 · 10 · 17 · 20 · 34 · 68 · 85 · 170 (half) · 340

Aliquot sum (sum of proper divisors): 416

Factor pairs (a × b = 340)

1 × 340

2 × 170

4 × 85

5 × 68

10 × 34

17 × 20

First multiples

340 · 680 (double) · 1,020 · 1,360 · 1,700 · 2,040 · 2,380 · 2,720 · 3,060 · 3,400

Sums & aliquot sequence

As a sum of two squares: 4² + 18² = 12² + 14²

As consecutive integers: 66 + 67 + 68 + 69 + 70 39 + 40 + … + 46 12 + 13 + … + 28

Aliquot sequence: 340 → 416 → 466 → 236 → 184 → 176 → 196 → 203 → 37 → 1 → 0 — terminates at zero

Representations

In words: three hundred forty
Ordinal: 340th
Roman numeral: CCCXL
Binary: 101010100
Octal: 524
Hexadecimal: 0x154
Base64: AVQ=
One's complement: 65,195 (16-bit)

In other bases

ternary (3) 110121

quaternary (4) 11110

quinary (5) 2330

senary (6) 1324

septenary (7) 664

nonary (9) 417

undecimal (11) 28a

duodecimal (12) 244

tridecimal (13) 202

tetradecimal (14) 1a4

pentadecimal (15) 17a

Historical numeral systems

Babylonian (base 60): 𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋
Egyptian hieroglyphic: 𓍢𓍢𓍢𓎆𓎆𓎆𓎆
Greek (Milesian): τμʹ
Mayan (base 20): 𝋱·𝋠
Chinese: 三百四十
Chinese (financial): 參佰肆拾

In other modern scripts

Eastern Arabic ٣٤٠ Devanagari ३४० Bengali ৩৪০ Tamil ௩௪௦ Thai ๓๔๐ Tibetan ༣༤༠ Khmer ៣៤០ Lao ໓໔໐ Burmese ၃၄၀

Digit at this position in famous constants

π — Pi (π): Digit 340 = 4
e — Euler's number (e): Digit 340 = 3
φ — Golden ratio (φ): Digit 340 = 9
√2 — Pythagoras's (√2): Digit 340 = 5
ln 2 — Natural log of 2: Digit 340 = 8
γ — Euler-Mascheroni (γ): Digit 340 = 9

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 340, here are decompositions:

3 + 337 = 340
23 + 317 = 340
29 + 311 = 340
47 + 293 = 340
59 + 281 = 340
71 + 269 = 340
83 + 257 = 340
89 + 251 = 340

Showing the first eight; more decompositions exist.

Unicode codepoint

Latin Capital Letter R With Acute

U+0154

Uppercase letter (Lu)

UTF-8 encoding: C5 94 (2 bytes).

Lookup U+0154 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#000154

RGB(0, 1, 84)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.1.84.

Address: 0.0.1.84
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.1.84

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

NANP area code 340

The number 340 is an active NANP area code (North American Numbering Plan).

Primary area: Statewide
Region: U.S. Virgin Islands
Country: United States

Most NANP area codes have multiple overlays in dense regions; the primary area listed is the historic/largest population center for this code.

Look up area code 340 ↗