990,840
990,840 is a composite number, even.
990,840 (nine hundred ninety thousand eight hundred forty) is an even 6-digit number. It is a composite number with 64 divisors, and factors as 2³ × 3 × 5 × 23 × 359. Its proper divisors sum to 2,119,560, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0xF1E78.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 30
- Digit product
- 0
- Digital root
- 3
- Palindrome
- No
- Bit width
- 20 bits
- Reversed
- 48,099
- Square (n²)
- 981,763,905,600
- Cube (n³)
- 972,770,948,224,704,000
- Divisor count
- 64
- σ(n) — sum of divisors
- 3,110,400
- φ(n) — Euler's totient
- 252,032
- Sum of prime factors
- 396
Primality
Prime factorization: 2 3 × 3 × 5 × 23 × 359
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√990,840 = [995; (2, 2, 3, 1, 4, 1, 3, 2, 2, 1990)]
Period length 10 — the block in parentheses repeats forever.
Representations
- In words
- nine hundred ninety thousand eight hundred forty
- Ordinal
- 990840th
- Binary
- 11110001111001111000
- Octal
- 3617170
- Hexadecimal
- 0xF1E78
- Base64
- Dx54
- One's complement
- 4,293,976,455 (32-bit)
- Scientific notation
- 9.9084 × 10⁵
- As a duration
- 990,840 s = 11 days, 11 hours, 14 minutes
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹 𒌋𒁹𒁹𒁹𒁹 ·
- Egyptian hieroglyphic
- 𓆐𓆐𓆐𓆐𓆐𓆐𓆐𓆐𓆐𓂍𓂍𓂍𓂍𓂍𓂍𓂍𓂍𓂍𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆
- Greek (Milesian)
- ͵ϡϟωμʹ
- Chinese
- 九十九萬零八百四十
- Chinese (financial)
- 玖拾玖萬零捌佰肆拾
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 990840, here are decompositions:
- 31 + 990809 = 990840
- 41 + 990799 = 990840
- 43 + 990797 = 990840
- 73 + 990767 = 990840
- 79 + 990761 = 990840
- 107 + 990733 = 990840
- 167 + 990673 = 990840
- 197 + 990643 = 990840
Showing the first eight; more decompositions exist.
As an unsigned 32-bit integer, this is the IPv4 address 0.15.30.120.
- Address
- 0.15.30.120
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.15.30.120
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 990,840 and was likely granted around 1911.
Patent numbers below 100,000 are excluded as too ambiguous; modern numbering currently reaches roughly 12.5 million.
The digit sequence 990840 first appears in π at position 328,710 of the decimal expansion (the 328,710ordinal-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
- Babylonian numerals — The base-60 cuneiform system that gave us 60 minutes, 60 seconds, and 360°.