Names of 1605
| Nominal | 1605 |
| Cardinal | one thousand six hundred five |
| Ordinal | 1,605th |
| This number as US currency | one thousand six hundred five dollars |
| Is 1605 an odd number? | 1605 is an odd number |
| Is 1605 an even number? | 1605 is NOT an even number |
| Is 1605 a palindrome? | 1605 is NOT a palindrome number |
| Is 1605 a triangle number? | 1605 is NOT a triangle number |
1605 in other Bases
| Base 2 (Binary) | 110010001012 |
| Base 3 (Ternary) | 20121103 |
| Base 4 (Quaternary) | 1210114 |
| Base 5 (Quinary) | 224105 |
| Base 6 (Senary) | 112336 |
| Base 8 (Octal) | 31058 |
| Base 12 (Duodecimal) | B1912 |
| Base 16 (Hexadecimal) | 64516 |
| Base 20 (Vigesimal) | 40520 |
Primes and Factors tests for 1605
| Is 1605 a Prime Number? | 1605 is NOT a prime |
| Is 1605 a perfect number? | 1605 is NOT a perfect number |
| Is 1605 a Mersenne Prime? | 1605 is NOT a Mersenne prime |
| Is 1605 a Fermat Prime? | 1605 is NOT a Fermat prime |
| Is 1605 a Fibonacci Prime? | 1605 is NOT a Fibonacci prime |
| Is 1605 a Partition Prime? | 1605 is NOT a Partition prime |
| Is 1605 a Pell Prime? | 1605 is NOT a Pell prime |
| Prime Factors | Prime factors of 1605 |
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1605 in other Numerals
| 1605 in Roman Numeral | MDCV |
| 1605 in Chinese Numeral | 壹仟陸佰伍 |
| 1605 in Egyptian Numeral | 𓆼𓍧𓏾 |
| 1605 in Babylonian Numeral |   |
Roots and stuff for 1605
| Is 1605 a square number? | 1605 is NOT a square number |
| Is 1605 a cube number? | 1605 is NOT a cube number |
| Square root of the number 1605 | 40.06245124802 |
| Cube root of the number 1605 | 11.708241691032 |
Recreational math for 1605
| Number 1605 reversed | 5061 |
| Sum of the digits | 12 |
| No of digits | 4 |