121,890
121,890 is a composite number, even.
121,890 (one hundred twenty-one thousand eight hundred ninety) is an even 6-digit number. It is a composite number with 32 divisors, and factors as 2 × 3 × 5 × 17 × 239. Its proper divisors sum to 189,150, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x1DC22.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 21
- Digit product
- 0
- Digital root
- 3
- Palindrome
- No
- Bit width
- 17 bits
- Reversed
- 98,121
- Square (n²)
- 14,857,172,100
- Cube (n³)
- 1,810,940,707,269,000
- Divisor count
- 32
- σ(n) — sum of divisors
- 311,040
- φ(n) — Euler's totient
- 30,464
- Sum of prime factors
- 266
Primality
Prime factorization: 2 × 3 × 5 × 17 × 239
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√121,890 = [349; (7, 1, 5, 2, 2, 2, 5, 1, 7, 698)]
Period length 10 — the block in parentheses repeats forever.
Representations
- In words
- one hundred twenty-one thousand eight hundred ninety
- Ordinal
- 121890th
- Binary
- 11101110000100010
- Octal
- 356042
- Hexadecimal
- 0x1DC22
- Base64
- Adwi
- One's complement
- 4,294,845,405 (32-bit)
- Scientific notation
- 1.2189 × 10⁵
- As a duration
- 121,890 s = 1 day, 9 hours, 51 minutes, 30 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹 𒌋𒌋𒌋
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆
- Greek (Milesian)
- ͵ρκαωϟʹ
- Mayan (base 20)
- 𝋯·𝋤·𝋮·𝋪
- Chinese
- 一十二萬一千八百九十
- Chinese (financial)
- 壹拾貳萬壹仟捌佰玖拾
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 121890, here are decompositions:
- 7 + 121883 = 121890
- 23 + 121867 = 121890
- 37 + 121853 = 121890
- 47 + 121843 = 121890
- 101 + 121789 = 121890
- 103 + 121787 = 121890
- 127 + 121763 = 121890
- 163 + 121727 = 121890
Showing the first eight; more decompositions exist.
As an unsigned 32-bit integer, this is the IPv4 address 0.1.220.34.
- Address
- 0.1.220.34
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.1.220.34
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 121,890 and was likely granted around 1871.
Patent numbers below 100,000 are excluded as too ambiguous; modern numbering currently reaches roughly 12.5 million.
The digit sequence 121890 first appears in π at position 519,288 of the decimal expansion (the 519,288ordinal-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°.