202
202 is a composite number, even, a calendar year.
202 (two hundred two) is an even 3-digit number. It is a composite number with 4 divisors, and factors as 2 × 101. Its digits read the same forwards and backwards, so it is a palindromic number. Written other ways, in Roman numerals it is CCII and in binary, 11001010.
Interestingness
Historical context — 202 AD
Calendar year
Year 202 (CCII) was a common year starting on Friday of the Julian calendar.
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Notable events — 202 BC
- Oct 19 Scipio Africanus defeats Hannibal at Zama, ending the Second Punic War.
Events compiled from Wikipedia ↗ · Licensed CC BY-SA 4.0
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
-
Friday
January 1, 202
- Ended on
-
Friday
December 31, 202
- Friday the 13ths
-
1
One Friday the 13th this year.
- Decade
-
200s
200–209
- Century
-
3rd century
201–300
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,824
1824 years before 2026.
In other calendars
- Hebrew
-
3962 / 3963 AM
Rosh Hashanah falls in September/October.
- Chinese
-
Year of the zodiac:Water zodiac:Horse
Sexagenary cycle position 19 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
745 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Ethiopian
-
194 / 195 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
124 / 123 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 2 × 101
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√202 = [14; (4, 1, 2, 2, 1, 4, 28)]
Period length 7 — the block in parentheses repeats forever.
Representations
- In words
- two hundred two
- Ordinal
- 202nd
- Roman numeral
- CCII
- Binary
- 11001010
- Octal
- 312
- Hexadecimal
- 0xCA
- Base64
- yg==
- One's complement
- 53 (8-bit)
- Scientific notation
- 2.02 × 10²
- As a duration
- 202 s = 3 minutes, 22 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹 𒌋𒌋𒁹𒁹
- Egyptian hieroglyphic
- 𓍢𓍢𓏺𓏺
- Greek (Milesian)
- σβʹ
- Mayan (base 20)
- 𝋪·𝋢
- Chinese
- 二百零二
- Chinese (financial)
- 貳佰零貳
Digit at this position in famous constants
- π — Pi (π)
- Digit 202 = 4
- e — Euler's number (e)
- Digit 202 = 1
- φ — Golden ratio (φ)
- Digit 202 = 0
- √2 — Pythagoras's (√2)
- Digit 202 = 0
- ln 2 — Natural log of 2
- Digit 202 = 0
- γ — Euler-Mascheroni (γ)
- Digit 202 = 6
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 202, here are decompositions:
- 3 + 199 = 202
- 5 + 197 = 202
- 11 + 191 = 202
- 23 + 179 = 202
- 29 + 173 = 202
- 53 + 149 = 202
- 71 + 131 = 202
- 89 + 113 = 202
Showing the first eight; more decompositions exist.
UTF-8 encoding: C3 8A (2 bytes).
HTTP 202 Accepted — Request accepted but processing is not complete.
2xx class: Success.
As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.202.
- Address
- 0.0.0.202
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.0.202
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The number 202 is an active NANP area code (North American Numbering Plan).
- Primary area
- Washington, D.C.
- Region
- District of Columbia
- 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, 202 Hz is closest to:
- Concert pitch (A4 = 440 Hz): G♯3 (207.7 Hz, -48¢ — about midway to G3)
- Scientific pitch (C4 = 256 Hz): G♯3 (203.2 Hz, -10¢)
- Baroque pitch (A4 = 415 Hz): A3 (207.5 Hz, -47¢ — about midway to G♯3)
On an ingredients label, E202 is Potassium sorbate, a preservative — a very common mould inhibitor in cheese, wine and baked goods.
Related reading
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.