Numberwise

1730

1730 is the year the sextant was developed.

2 confirmed records · 2 sourcesChecked and sourcedChecked, general knowledgeHow we qualify claimsReport a correction

Where 1730 fits

Where 1730 fits: History, Related numbersHistory: Historical years. Related numbers: 1714.HistoryHistorical yearsRelated numbers17141730
1730 connects to 2 worlds: history, related numbers.

Why 1730 is special

Measuring the angle between a star and the horizon gave latitude reliably at sea. Longitude took another forty years and a different instrument entirely.

1730 is part of

Numbers around us

Factors & digit properties

Divisors (8)
1, 2, 5, 10, 173, 346, 865, 1730
Prime factorisation
2 × 5 × 173
Digit sum
11
Digital root
2

Representations

Decimal
1730
Scientific notation
1.730 × 10^3

Roman numerals

M D C C X X X

Binary

1 1 0 1 1 0 0 0 0 1 0

1 × 1,024 + 1 × 512 + 0 × 256 + 1 × 128 + 1 × 64 + 0 × 32 + 0 × 16 + 0 × 8 + 0 × 4 + 1 × 2 + 0 × 1 = 1,730

Octal

3 3 0 2

3 × 512 + 3 × 64 + 0 × 8 + 2 × 1 = 1,730

Hexadecimal

6 c 2

6 × 256 + c × 16 + 2 × 1 = 1,730

Read as powers of two: 1,024 + 512 + 128 + 64 + 2 = 1,730.

In historical numeral systems

Egyptian

1 lotus, 7 coils of rope, 3 hobbles

1 × 1,000 + 7 × 100 + 3 × 10 = 1,730. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.

Babylonian

2 corner wedges + 8 vertical wedges (sixties place), 5 corner wedges (units place)

28 × 60 + 50 = 1730. Places are separated by a space on the tablet, with the higher place written first.

Systems that simply cannot reach this value are left out. Where a script needs a font most readers do not have, the reading is given instead of the glyphs — see number systems for each system in full.

Other mathematical patterns

  • Deficient number

Related numbers & connections

Documented appearance
1730 is a year in the 18th century, in the 1730s.

1730 is a year in the 18th century, in the 1730s.

Connection
The sextant from around 1730 made latitude routine at sea, and the Longitude Act of 1714 had already offered a prize for the harder half of the problem.

The sextant from around 1730 made latitude routine at sea, and the Longitude Act of 1714 had already offered a prize for the harder half of the problem.

View 1714 →

Numbers Around Us

  • appears inHistorical years
    why?

    Strength 0.50, confidence "high".

Other connections

  • developed from1714
    why?

    Strength 0.50, confidence "high".

How is 1730 connected to another number? →

Technology & computing

  • In 1730, the sextant was developed independently by John Hadley and Thomas Godfrey, making accurate latitude routine at sea (England and North America).

    DocumentedTechnology & computingGeography: England and North AmericaPeriod: 1730

  • The sextant from around 1730 made latitude at sea a routine measurement. Longitude remained unsolved until Harrison's chronometers, which is why the two problems are so often confused.

    DocumentedTechnology & computingPeriod: 1730

Common questions

Is 1730 a prime number?

No, 1730 is not prime.

What are the factors of 1730?

The factors of 1730 are 1, 2, 5, 10, 173, 346, 865, 1730.

What is 1730 in Roman numerals?

1730 in Roman numerals is MDCCXXX.

About this page's data

Mathematical facts:computed directly from the number's value — nothing to source or verify externally.

Contextual records: 2 reviewer-confirmed records, sourced and reviewed before publication.

Last reviewed: 15 July 2026