172,920
172,920 is a composite number, even.
172,920 (one hundred seventy-two thousand nine hundred twenty) is an even 6-digit number. It is a composite number with 64 divisors, and factors as 2³ × 3 × 5 × 11 × 131. Its proper divisors sum to 397,320, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x2A378.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 21
- Digit product
- 0
- Digital root
- 3
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 29,271
- Square (n²)
- 29,901,326,400
- Cube (n³)
- 5,170,537,361,088,000
- Divisor count
- 64
- σ(n) — sum of divisors
- 570,240
- φ(n) — Euler's totient
- 41,600
- Sum of prime factors
- 156
Primality
Prime factorization: 2 3 × 3 × 5 × 11 × 131
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√172,920 = [415; (1, 5, 8, 1, 1, 2, 2, 1, 6, 2, 6, 2, 6, 1, 2, 2, 1, 1, 8, 5, 1, 830)]
Period length 22 — the block in parentheses repeats forever.
Representations
- In words
- one hundred seventy-two thousand nine hundred twenty
- Ordinal
- 172920th
- Binary
- 101010001101111000
- Octal
- 521570
- Hexadecimal
- 0x2A378
- Base64
- AqN4
- One's complement
- 4,294,794,375 (32-bit)
- Scientific notation
- 1.7292 × 10⁵
- As a duration
- 172,920 s = 2 days, 2 minutes
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒁹𒁹 ·
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓂍𓂍𓂍𓂍𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆
- Greek (Milesian)
- ͵ροβϡκʹ
- Chinese
- 一十七萬二千九百二十
- Chinese (financial)
- 壹拾柒萬貳仟玖佰貳拾
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 172920, here are decompositions:
- 37 + 172883 = 172920
- 43 + 172877 = 172920
- 53 + 172867 = 172920
- 61 + 172859 = 172920
- 67 + 172853 = 172920
- 71 + 172849 = 172920
- 113 + 172807 = 172920
- 179 + 172741 = 172920
Showing the first eight; more decompositions exist.
UTF-8 encoding: F0 AA 8D B8 (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.163.120.
- Address
- 0.2.163.120
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.163.120
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 172,920 and was likely granted around 1874.
Patent numbers below 100,000 are excluded as too ambiguous; modern numbering currently reaches roughly 12.5 million.
The digit sequence 172920 first appears in π at position 387,952 of the decimal expansion (the 387,952ordinal-suffix:nd 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°.