308
308 is a composite number, even, a calendar year.
308 (three hundred eight) is an even 3-digit number. It is a composite number with 12 divisors, and factors as 2² × 7 × 11. Its proper divisors sum to 364, more than the number itself, making it an abundant number. Written other ways, in Roman numerals it is CCCVIII and in binary, 100110100.
Interestingness
Historical context — 308 AD
Calendar year
Year 308 (CCCVIII) was a leap year starting on Thursday of the Julian calendar.
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Historical context — 308 BC
Calendar year
Year 308 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
-
53
Long year: contains 53 ISO weeks.
- Started on
-
Wednesday
January 1, 308
- Ended on
-
Thursday
December 31, 308
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Decade
-
300s
300–309
- Century
-
4th century
301–400
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,718
1718 years before 2026.
In other calendars
- Hebrew
-
4068 / 4069 AM
Rosh Hashanah falls in September/October.
- Chinese
-
Year of the zodiac:Earth zodiac:Dragon
Sexagenary cycle position 5 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
851 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Ethiopian
-
300 / 301 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
230 / 229 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 2 2 × 7 × 11
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√308 = [17; (1, 1, 4, 1, 1, 34)]
Period length 6 — the block in parentheses repeats forever.
Representations
- In words
- three hundred eight
- Ordinal
- 308th
- Roman numeral
- CCCVIII
- Binary
- 100110100
- Octal
- 464
- Hexadecimal
- 0x134
- Base64
- ATQ=
- One's complement
- 65,227 (16-bit)
- Scientific notation
- 3.08 × 10²
- As a duration
- 308 s = 5 minutes, 8 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹𒁹 𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓍢𓍢𓍢𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- τηʹ
- Mayan (base 20)
- 𝋯·𝋨
- Chinese
- 三百零八
- Chinese (financial)
- 參佰零捌
Digit at this position in famous constants
- π — Pi (π)
- Digit 308 = 0
- e — Euler's number (e)
- Digit 308 = 7
- φ — Golden ratio (φ)
- Digit 308 = 2
- √2 — Pythagoras's (√2)
- Digit 308 = 3
- ln 2 — Natural log of 2
- Digit 308 = 5
- γ — Euler-Mascheroni (γ)
- Digit 308 = 5
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 308, here are decompositions:
- 31 + 277 = 308
- 37 + 271 = 308
- 67 + 241 = 308
- 79 + 229 = 308
- 97 + 211 = 308
- 109 + 199 = 308
- 127 + 181 = 308
- 151 + 157 = 308
Showing the first eight; more decompositions exist.
UTF-8 encoding: C4 B4 (2 bytes).
HTTP 308 Permanent Redirect — Same as 301 but the request method must not change.
3xx class: Redirection.
As an unsigned 32-bit integer, this is the IPv4 address 0.0.1.52.
- Address
- 0.0.1.52
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.1.52
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The number 308 is an active NANP area code (North American Numbering Plan).
- Primary area
- Western Nebraska
- Region
- Nebraska
- 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.
Heard as a frequency, 308 Hz is closest to:
- Concert pitch (A4 = 440 Hz): D♯4 (311.1 Hz, -17¢)
- Scientific pitch (C4 = 256 Hz): D♯4 (304.4 Hz, +20¢)
- Baroque pitch (A4 = 415 Hz): E4 (310.9 Hz, -16¢)
Related reading
- Mayan numerals — Vigesimal dots-and-bars with a shell zero — one of the earliest true zeros.