138,980
138,980 is a composite number, even.
138,980 (one hundred thirty-eight thousand nine hundred eighty) is an even 6-digit number. It is a composite number with 12 divisors, and factors as 2² × 5 × 6,949. Its proper divisors sum to 152,920, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x21EE4.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 29
- Digit product
- 0
- Digital root
- 2
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 89,831
- Recamán's sequence
- a(490,867) = 138,980
- Square (n²)
- 19,315,440,400
- Cube (n³)
- 2,684,459,906,792,000
- Divisor count
- 12
- σ(n) — sum of divisors
- 291,900
- φ(n) — Euler's totient
- 55,584
- Sum of prime factors
- 6,958
Primality
Prime factorization: 2 2 × 5 × 6949
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√138,980 = [372; (1, 4, 186, 4, 1, 744)]
Period length 6 — the block in parentheses repeats forever.
Representations
- In words
- one hundred thirty-eight thousand nine hundred eighty
- Ordinal
- 138980th
- Binary
- 100001111011100100
- Octal
- 417344
- Hexadecimal
- 0x21EE4
- Base64
- Ah7k
- One's complement
- 4,294,828,315 (32-bit)
- Scientific notation
- 1.3898 × 10⁵
- As a duration
- 138,980 s = 1 day, 14 hours, 36 minutes, 20 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆
- Greek (Milesian)
- ͵ρληϡπʹ
- Mayan (base 20)
- 𝋱·𝋧·𝋩·𝋠
- Chinese
- 一十三萬八千九百八十
- Chinese (financial)
- 壹拾參萬捌仟玖佰捌拾
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 138980, here are decompositions:
- 3 + 138977 = 138980
- 13 + 138967 = 138980
- 43 + 138937 = 138980
- 97 + 138883 = 138980
- 139 + 138841 = 138980
- 151 + 138829 = 138980
- 181 + 138799 = 138980
- 241 + 138739 = 138980
Showing the first eight; more decompositions exist.
UTF-8 encoding: F0 A1 BB A4 (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.30.228.
- Address
- 0.2.30.228
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.30.228
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 138,980 and was likely granted around 1872.
Patent numbers below 100,000 are excluded as too ambiguous; modern numbering currently reaches roughly 12.5 million.
The digit sequence 138980 first appears in π at position 305,444 of the decimal expansion (the 305,444ordinal-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.