853
+853 is the international calling code for Macau.
- Odd
- Prime
Where 853 fits
Why 853 is special
Macau was Portuguese until 1999 and, like Hong Kong, kept its own currency, legal system and calling code after transfer to China.
853 is part of
Factors & digit properties
- Divisors (2)
- 1, 853
- Prime factorisation
- 853
- Digit sum
- 16
- Digital root
- 7
Representations
- Decimal
- 853
- Binary
- 1101010101
- Octal
- 1525
- Hexadecimal
- 355
- Roman numeral
- DCCCLIII
- Scientific notation
- 8.530 × 10^2
Other mathematical patterns
- Deficient number
Related numbers & connections
Macau and Hong Kong were both transferred to China under arrangements preserving separate systems, and both kept their own calling codes and currencies.
View 852 →Other connections
- is associated with852
why?
Strength 0.50, confidence "high".
Geography
+853 reaches Macau, transferred from Portugal to China in 1999 under an arrangement similar to Hong Kong's, retaining its own code and currency.
DocumentedGeographyGeography: Macau
Common questions
Is 853 a prime number?
Yes, 853 is prime — it has exactly two positive divisors: 1 and itself.
What are the factors of 853?
The factors of 853 are 1, 853.
What is 853 in Roman numerals?
853 in Roman numerals is DCCCLIII.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 1 reviewer-confirmed record, sourced and reviewed before publication.
Last reviewed: 3 August 2026