998
998 is a composite number, even, a calendar year.
Historical context — 998 AD
Calendar year
Year 998 (CMXCVIII) was a common year starting on Saturday of the Julian calendar.
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Historical context — 998 BC
Decade
The 990s BC is a decade that lasted from 999 BC to 990 BC.
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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
-
Monday
January 1, 998
- Ended on
-
Monday
December 31, 998
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Decade
-
990s
990–999
- Century
-
10th century
901–1000
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,028
1028 years before 2026.
In other calendars
- Hebrew
-
4758 / 4759 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
387 / 389 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Earth zodiac:Dog
Sexagenary cycle position 35 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1541 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
376 / 377 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
990 / 991 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
920 / 919 Saka
Indian national calendar; year starts in March.
Properties
- Parity
- Even
- Digit count
- 3
- Digit sum
- 26
- Digit product
- 648
- Digital root
- 8
- Palindrome
- No
- Bit width
- 10 bits
- Reversed
- 899
- Flips to (rotate 180°)
- 866
- Recamán's sequence
- a(4,423) = 998
- Square (n²)
- 996,004
- Cube (n³)
- 994,011,992
- Divisor count
- 4
- σ(n) — sum of divisors
- 1,500
- φ(n) — Euler's totient
- 498
- Sum of prime factors
- 501
Primality
Prime factorization: 2 × 499
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- nine hundred ninety-eight
- Ordinal
- 998th
- Roman numeral
- CMXCVIII
- Binary
- 1111100110
- Octal
- 1746
- Hexadecimal
- 0x3E6
- Base64
- A+Y=
- One's complement
- 64,537 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ϡϟηʹ
- Mayan (base 20)
- 𝋢·𝋩·𝋲
- Chinese
- 九百九十八
- Chinese (financial)
- 玖佰玖拾捌
Digit at this position in famous constants
- π — Pi (π)
- Digit 998 = 1
- e — Euler's number (e)
- Digit 998 = 0
- φ — Golden ratio (φ)
- Digit 998 = 9
- √2 — Pythagoras's (√2)
- Digit 998 = 8
- ln 2 — Natural log of 2
- Digit 998 = 5
- γ — Euler-Mascheroni (γ)
- Digit 998 = 9
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 998, here are decompositions:
- 7 + 991 = 998
- 31 + 967 = 998
- 61 + 937 = 998
- 79 + 919 = 998
- 139 + 859 = 998
- 211 + 787 = 998
- 229 + 769 = 998
- 241 + 757 = 998
Showing the first eight; more decompositions exist.
UTF-8 encoding: CF A6 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.3.230.
- Address
- 0.0.3.230
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.3.230
Unspecified address (0.0.0.0/8) — "this network" placeholder.