999,990
999,990 is a composite number, even.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 45
- Digit product
- 0
- Digital root
- 9
- Palindrome
- No
- Bit width
- 20 bits
- Reversed
- 99,999
- Flips to (rotate 180°)
- 66,666
- Square (n²)
- 999,980,000,100
- Cube (n³)
- 999,970,000,299,999,000
- Divisor count
- 48
- σ(n) — sum of divisors
- 2,673,216
- φ(n) — Euler's totient
- 259,200
- Sum of prime factors
- 325
Primality
Prime factorization: 2 × 3 2 × 5 × 41 × 271
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√999,990 = [999; (1, 198, 1, 1998)]
Period length 4 — the block in parentheses repeats forever.
Representations
- In words
- nine hundred ninety-nine thousand nine hundred ninety
- Ordinal
- 999990th
- Binary
- 11110100001000110110
- Octal
- 3641066
- Hexadecimal
- 0xF4236
- Base64
- D0I2
- One's complement
- 4,293,967,305 (32-bit)
- Scientific notation
- 9.9999 × 10⁵
- As a duration
- 999,990 s = 11 days, 13 hours, 46 minutes, 30 seconds
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋
- Egyptian hieroglyphic
- 𓆐𓆐𓆐𓆐𓆐𓆐𓆐𓆐𓆐𓂍𓂍𓂍𓂍𓂍𓂍𓂍𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆
- Greek (Milesian)
- ͵ϡϟθϡϟʹ
- Chinese
- 九十九萬九千九百九十
- Chinese (financial)
- 玖拾玖萬玖仟玖佰玖拾
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 999990, here are decompositions:
- 7 + 999983 = 999990
- 11 + 999979 = 999990
- 29 + 999961 = 999990
- 31 + 999959 = 999990
- 37 + 999953 = 999990
- 59 + 999931 = 999990
- 73 + 999917 = 999990
- 83 + 999907 = 999990
Showing the first eight; more decompositions exist.
As an unsigned 32-bit integer, this is the IPv4 address 0.15.66.54.
- Address
- 0.15.66.54
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.15.66.54
Unspecified address (0.0.0.0/8) — "this network" placeholder.
This number falls in the range of US utility patent numbers. If it's a patent, it would be issued as US 999,990 and was likely granted around 1911.
Patent numbers below 100,000 are excluded as too ambiguous; modern numbering currently reaches roughly 12.5 million.