Number

345

345 is a composite number, odd, a calendar year.

Arithmetic Number Ascending Digits Consecutive Digits Deficient Number Odious Number Pernicious Number Recamán's Sequence Self Number Sphenic Number Squarefree Year

Historical context — 345 AD

Calendar year

The Year 345 (CCCXLV) was a common year starting on Tuesday of the Julian calendar.

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

Historical context — 345 BC

Calendar year

Year 345 BC was a year of the pre-Julian Roman calendar.

Excerpt from Wikipedia (en) ↗ · Licensed CC BY-SA 4.0 · English fallback 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: Monday
January 1, 345
Ended on: Monday
December 31, 345
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: 1,681
1681 years before 2026.

In other calendars

Hebrew: 4105 / 4106 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Wood zodiac:Snake
Sexagenary cycle position 42 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 888 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 337 / 338 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 267 / 266 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 3
Digit sum: 12
Digit product: 60
Digital root: 3
Palindrome: No
Bit width: 9 bits
Reversed: 543
Recamán's sequence: a(558) = 345
Square (n²): 119,025
Cube (n³): 41,063,625
Divisor count: 8
σ(n) — sum of divisors: 576
φ(n) — Euler's totient: 176
Sum of prime factors: 31

Primality

Prime factorization: 3 × 5 × 23

Nearest primes: 337 (−8) · 347 (+2)

Divisors & multiples

All divisors (8)

1 · 3 · 5 · 15 · 23 · 69 · 115 · 345

Aliquot sum (sum of proper divisors): 231

Factor pairs (a × b = 345)

1 × 345

3 × 115

5 × 69

15 × 23

First multiples

345 · 690 (double) · 1,035 · 1,380 · 1,725 · 2,070 · 2,415 · 2,760 · 3,105 · 3,450

Sums & aliquot sequence

As consecutive integers: 172 + 173 114 + 115 + 116 67 + 68 + 69 + 70 + 71 55 + 56 + 57 + 58 + 59 + 60

Aliquot sequence: 345 → 231 → 153 → 81 → 40 → 50 → 43 → 1 → 0 — terminates at zero

Representations

In words: three hundred forty-five
Ordinal: 345th
Roman numeral: CCCXLV
Binary: 101011001
Octal: 531
Hexadecimal: 0x159
Base64: AVk=
One's complement: 65,190 (16-bit)

In other bases

ternary (3) 110210

quaternary (4) 11121

quinary (5) 2340

senary (6) 1333

septenary (7) 1002

nonary (9) 423

undecimal (11) 294

duodecimal (12) 249

tridecimal (13) 207

tetradecimal (14) 1a9

pentadecimal (15) 180

Historical numeral systems

Babylonian (base 60): 𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): τμεʹ
Mayan (base 20): 𝋱·𝋥
Chinese: 三百四十五
Chinese (financial): 參佰肆拾伍

In other modern scripts

Eastern Arabic ٣٤٥ Devanagari ३४५ Bengali ৩৪৫ Tamil ௩௪௫ Thai ๓๔๕ Tibetan ༣༤༥ Khmer ៣៤៥ Lao ໓໔໕ Burmese ၃၄၅

Digit at this position in famous constants

π — Pi (π): Digit 345 = 1
e — Euler's number (e): Digit 345 = 6
φ — Golden ratio (φ): Digit 345 = 3
√2 — Pythagoras's (√2): Digit 345 = 4
ln 2 — Natural log of 2: Digit 345 = 8
γ — Euler-Mascheroni (γ): Digit 345 = 1

Also seen as

Unicode codepoint

Latin Small Letter R With Caron

U+0159

Lowercase letter (Ll)

UTF-8 encoding: C5 99 (2 bytes).

Lookup U+0159 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#000159

RGB(0, 1, 89)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.1.89.

Address: 0.0.1.89
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.1.89

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

NANP area code 345

The number 345 is an active NANP area code (North American Numbering Plan).

Primary area: Statewide
Region: Cayman Islands
Country: Cayman Islands

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 345 ↗

Calculator-display word

Type 345 on a seven-segment calculator, flip it 180°, and the display reads:

ShE

A staple of calculator humor since pocket calculators put digits in front of bored students.