9,990
9,990 is a composite number, even.
Properties
- Parity
- Even
- Digit count
- 4
- Digit sum
- 27
- Digit product
- 0
- Digital root
- 9
- Palindrome
- No
- Bit width
- 14 bits
- Reversed
- 999
- Flips to (rotate 180°)
- 666
- Recamán's sequence
- a(7,235) = 9,990
- Square (n²)
- 99,800,100
- Cube (n³)
- 997,002,999,000
- Divisor count
- 32
- σ(n) — sum of divisors
- 27,360
- φ(n) — Euler's totient
- 2,592
- Sum of prime factors
- 53
Primality
Prime factorization: 2 × 3 3 × 5 × 37
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- nine thousand nine hundred ninety
- Ordinal
- 9990th
- Binary
- 10011100000110
- Octal
- 23406
- Hexadecimal
- 0x2706
- Base64
- JwY=
- One's complement
- 55,545 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋
- Egyptian hieroglyphic
- 𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆
- Greek (Milesian)
- ͵θϡϟʹ
- Mayan (base 20)
- 𝋡·𝋤·𝋳·𝋪
- Chinese
- 九千九百九十
- Chinese (financial)
- 玖仟玖佰玖拾
Digit at this position in famous constants
- π — Pi (π)
- Digit 9,990 = 6
- e — Euler's number (e)
- Digit 9,990 = 1
- φ — Golden ratio (φ)
- Digit 9,990 = 3
- √2 — Pythagoras's (√2)
- Digit 9,990 = 2
- ln 2 — Natural log of 2
- Digit 9,990 = 6
- γ — Euler-Mascheroni (γ)
- Digit 9,990 = 6
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 9990, here are decompositions:
- 17 + 9973 = 9990
- 23 + 9967 = 9990
- 41 + 9949 = 9990
- 59 + 9931 = 9990
- 61 + 9929 = 9990
- 67 + 9923 = 9990
- 83 + 9907 = 9990
- 89 + 9901 = 9990
Showing the first eight; more decompositions exist.
UTF-8 encoding: E2 9C 86 (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.39.6.
- Address
- 0.0.39.6
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.39.6
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 9990 first appears in π at position 25,584 of the decimal expansion (the 25,584ordinal-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.