9,800
9,800 is a composite number, even.
9,800 (nine thousand eight hundred) is an even 4-digit number. It is a composite number with 36 divisors, and factors as 2³ × 5² × 7². Its proper divisors sum to 16,705, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x2648.
Interestingness
Properties
- Parity
- Even
- Digit count
- 4
- Digit sum
- 17
- Digit product
- 0
- Digital root
- 8
- Palindrome
- No
- Bit width
- 14 bits
- Reversed
- 89
- Flips to (rotate 180°)
- 86
- Recamán's sequence
- a(8,611) = 9,800
- Square (n²)
- 96,040,000
- Cube (n³)
- 941,192,000,000
- Divisor count
- 36
- σ(n) — sum of divisors
- 26,505
- φ(n) — Euler's totient
- 3,360
- Sum of prime factors
- 30
Primality
Prime factorization: 2 3 × 5 2 × 7 2
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√9,800 = [98; (1, 196)]
Period length 2 — the block in parentheses repeats forever.
Representations
- In words
- nine thousand eight hundred
- Ordinal
- 9800th
- Binary
- 10011001001000
- Octal
- 23110
- Hexadecimal
- 0x2648
- Base64
- Jkg=
- One's complement
- 55,735 (16-bit)
- Scientific notation
- 9.8 × 10³
- As a duration
- 9,800 s = 2 hours, 43 minutes, 20 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹 𒌋𒌋
- Egyptian hieroglyphic
- 𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢
- Greek (Milesian)
- ͵θωʹ
- Mayan (base 20)
- 𝋡·𝋤·𝋪·𝋠
- Chinese
- 九千八百
- Chinese (financial)
- 玖仟捌佰
Digit at this position in famous constants
- π — Pi (π)
- Digit 9,800 = 7
- e — Euler's number (e)
- Digit 9,800 = 6
- φ — Golden ratio (φ)
- Digit 9,800 = 3
- √2 — Pythagoras's (√2)
- Digit 9,800 = 5
- ln 2 — Natural log of 2
- Digit 9,800 = 6
- γ — Euler-Mascheroni (γ)
- Digit 9,800 = 3
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 9800, here are decompositions:
- 13 + 9787 = 9800
- 19 + 9781 = 9800
- 31 + 9769 = 9800
- 61 + 9739 = 9800
- 67 + 9733 = 9800
- 79 + 9721 = 9800
- 103 + 9697 = 9800
- 139 + 9661 = 9800
Showing the first eight; more decompositions exist.
UTF-8 encoding: E2 99 88 (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.38.72.
- Address
- 0.0.38.72
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.38.72
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 9,800 Hz is closest to:
- Concert pitch (A4 = 440 Hz): D♯9 (9956.1 Hz, -27¢)
- Scientific pitch (C4 = 256 Hz): D♯9 (9742 Hz, +10¢)
- Baroque pitch (A4 = 415 Hz): E9 (9948.8 Hz, -26¢)
The digit sequence 9800 first appears in π at position 6,634 of the decimal expansion (the 6,634ordinal-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
- Mayan numerals — Vigesimal dots-and-bars with a shell zero — one of the earliest true zeros.