1,210
1,210 is a composite number, even, a calendar year.
1,210 (one thousand two hundred ten) is an even 4-digit number. It is a composite number with 12 divisors, and factors as 2 × 5 × 11². Written other ways, in Roman numerals it is MCCX and in binary, 10010111010.
Interestingness
Historical context — 1210 AD
Calendar year
Year 1210 (MCCX) was a common year starting on Friday of the Julian calendar.
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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, 1210
- Ended on
-
Friday
December 31, 1210
- Friday the 13ths
-
1
One Friday the 13th this year.
- Decade
-
1210s
1210–1219
- Century
-
13th century
1201–1300
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
816
816 years before 2026.
In other calendars
- Hebrew
-
4970 / 4971 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
606 / 607 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Metal zodiac:Horse
Sexagenary cycle position 7 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1753 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
588 / 589 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1202 / 1203 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1132 / 1131 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 2 × 5 × 11 2
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√1,210 = [34; (1, 3, 1, 1, 1, 7, 11, 2, 6, 2, 11, 7, 1, 1, 1, 3, 1, 68)]
Period length 18 — the block in parentheses repeats forever.
Representations
- In words
- one thousand two hundred ten
- Ordinal
- 1210th
- Roman numeral
- MCCX
- Binary
- 10010111010
- Octal
- 2272
- Hexadecimal
- 0x4BA
- Base64
- BLo=
- One's complement
- 64,325 (16-bit)
- Scientific notation
- 1.21 × 10³
- As a duration
- 1,210 s = 20 minutes, 10 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋 𒌋
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓎆
- Greek (Milesian)
- ͵ασιʹ
- Mayan (base 20)
- 𝋣·𝋠·𝋪
- Chinese
- 一千二百一十
- Chinese (financial)
- 壹仟貳佰壹拾
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,210 = 3
- e — Euler's number (e)
- Digit 1,210 = 6
- φ — Golden ratio (φ)
- Digit 1,210 = 2
- √2 — Pythagoras's (√2)
- Digit 1,210 = 6
- ln 2 — Natural log of 2
- Digit 1,210 = 4
- γ — Euler-Mascheroni (γ)
- Digit 1,210 = 9
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1210, here are decompositions:
- 17 + 1193 = 1210
- 23 + 1187 = 1210
- 29 + 1181 = 1210
- 47 + 1163 = 1210
- 59 + 1151 = 1210
- 101 + 1109 = 1210
- 107 + 1103 = 1210
- 113 + 1097 = 1210
Showing the first eight; more decompositions exist.
UTF-8 encoding: D2 BA (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.4.186.
- Address
- 0.0.4.186
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.4.186
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 1,210 Hz is closest to:
- Concert pitch (A4 = 440 Hz): D♯6 (1244.5 Hz, -49¢ — about midway to D6)
- Scientific pitch (C4 = 256 Hz): D♯6 (1217.7 Hz, -11¢)
- Baroque pitch (A4 = 415 Hz): E6 (1243.6 Hz, -47¢ — about midway to D♯6)
The digit sequence 1210 first appears in π at position 3,455 of the decimal expansion (the 3,455ordinal-suffix:th digit after the integer 3).
Search range: the first 1,000,000 fractional digits of π. Any 6-digit-or-shorter string is virtually guaranteed to appear in there — the more interesting signal is the position.
Related reading
- Amicable numbers — Pairs of numbers, each the sum of the other's divisors — a Pythagorean symbol of friendship.
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.