189 (number)
Natural number
From Wikipedia, the free encyclopedia
189 (one hundred [and] eighty-nine) is the natural number following 188 and preceding 190.
Cardinalone hundred eighty-nine
Ordinal189th
(one hundred eighty-ninth)
(one hundred eighty-ninth)
Factorization33 Ã 7
Divisors1, 3, 7, 9, 21, 27, 63, 189
| ||||
|---|---|---|---|---|
| Cardinal | one hundred eighty-nine | |||
| Ordinal | 189th (one hundred eighty-ninth) | |||
| Factorization | 33 Ã 7 | |||
| Divisors | 1, 3, 7, 9, 21, 27, 63, 189 | |||
| Greek numeral | ΡΠδ | |||
| Roman numeral | CLXXXIX, clxxxix | |||
| Binary | 101111012 | |||
| Ternary | 210003 | |||
| Senary | 5136 | |||
| Octal | 2758 | |||
| Duodecimal | 13912 | |||
| Hexadecimal | BD16 | |||
In mathematics
189 is a centered cube number[1] and a heptagonal number.[2] The centered cube numbers are the sums of two consecutive cubes, and 189 can be written as sum of two cubes in two ways: 43 + 53 and 63 + (â3)3.[3] The smallest number that can be written as the sum of two positive cubes in two ways is 1729.[4]
The largest prime number that can be represented in 256-bit arithmetic is the "ultra-useful prime" 2256 â 189,[5] used in quasi-Monte Carlo methods[6] and in some cryptographic systems.[7]
