138,621
138,621 is a composite number, odd.
138,621 (one hundred thirty-eight thousand six hundred twenty-one) is an odd 6-digit number. It is a composite number with 24 divisors, and factors as 3 × 7² × 23 × 41. Written other ways, in hexadecimal, 0x21D7D.
Interestingness
Properties
- Parity
- Odd
- Digit count
- 6
- Digit sum
- 21
- Digit product
- 288
- Digital root
- 3
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 126,831
- Recamán's sequence
- a(491,585) = 138,621
- Square (n²)
- 19,215,781,641
- Cube (n³)
- 2,663,710,866,857,061
- Divisor count
- 24
- σ(n) — sum of divisors
- 229,824
- φ(n) — Euler's totient
- 73,920
- Sum of prime factors
- 81
Primality
Prime factorization: 3 × 7 2 × 23 × 41
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√138,621 = [372; (3, 7, 8, 1, 5, 15, 37, 6, 37, 15, 5, 1, 8, 7, 3, 744)]
Period length 16 — the block in parentheses repeats forever.
Representations
- In words
- one hundred thirty-eight thousand six hundred twenty-one
- Ordinal
- 138621st
- Binary
- 100001110101111101
- Octal
- 416575
- Hexadecimal
- 0x21D7D
- Base64
- Ah19
- One's complement
- 4,294,828,674 (32-bit)
- Scientific notation
- 1.38621 × 10⁵
- As a duration
- 138,621 s = 1 day, 14 hours, 30 minutes, 21 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋 𒌋𒌋𒁹
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓏺
- Greek (Milesian)
- ͵ρληχκαʹ
- Mayan (base 20)
- 𝋱·𝋦·𝋫·𝋡
- Chinese
- 一十三萬八千六百二十一
- Chinese (financial)
- 壹拾參萬捌仟陸佰貳拾壹
Also seen as
UTF-8 encoding: F0 A1 B5 BD (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.29.125.
- Address
- 0.2.29.125
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.29.125
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 138,621 and was likely granted around 1872.
Patent numbers below 100,000 are excluded as too ambiguous; modern numbering currently reaches roughly 12.5 million.
Related reading
- Babylonian numerals — The base-60 cuneiform system that gave us 60 minutes, 60 seconds, and 360°.