Names of 1805
| Nominal | 1805 |
| Cardinal | one thousand eight hundred five |
| Ordinal | 1,805th |
| This number as US currency | one thousand eight hundred five dollars |
| Is 1805 an odd number? | 1805 is an odd number |
| Is 1805 an even number? | 1805 is NOT an even number |
| Is 1805 a palindrome? | 1805 is NOT a palindrome number |
| Is 1805 a triangle number? | 1805 is NOT a triangle number |
1805 in other Bases
| Base 2 (Binary) | 111000011012 |
| Base 3 (Ternary) | 21102123 |
| Base 4 (Quaternary) | 1300314 |
| Base 5 (Quinary) | 242105 |
| Base 6 (Senary) | 122056 |
| Base 8 (Octal) | 34158 |
| Base 12 (Duodecimal) | 106512 |
| Base 16 (Hexadecimal) | 70D16 |
| Base 20 (Vigesimal) | 4A520 |
Primes and Factors tests for 1805
| Is 1805 a Prime Number? | 1805 is NOT a prime |
| Is 1805 a perfect number? | 1805 is NOT a perfect number |
| Is 1805 a Mersenne Prime? | 1805 is NOT a Mersenne prime |
| Is 1805 a Fermat Prime? | 1805 is NOT a Fermat prime |
| Is 1805 a Fibonacci Prime? | 1805 is NOT a Fibonacci prime |
| Is 1805 a Partition Prime? | 1805 is NOT a Partition prime |
| Is 1805 a Pell Prime? | 1805 is NOT a Pell prime |
| Prime Factors | Prime factors of 1805 |
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1805 in other Numerals
| 1805 in Roman Numeral | MDCCCV |
| 1805 in Chinese Numeral | 壹仟捌佰伍 |
| 1805 in Egyptian Numeral | 𓆼𓍩𓏾 |
| 1805 in Babylonian Numeral |   |
Roots and stuff for 1805
| Is 1805 a square number? | 1805 is NOT a square number |
| Is 1805 a cube number? | 1805 is NOT a cube number |
| Square root of the number 1805 | 42.485291572496 |
| Cube root of the number 1805 | 12.175656915224 |
Recreational math for 1805
| Number 1805 reversed | 5081 |
| Sum of the digits | 14 |
| No of digits | 4 |