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189

189
← 188 189 190 →
数表整数

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命名
小寫一百八十九
大寫壹佰捌拾玖
序數詞第一百八十九
one hundred and eighty-ninth
識別
種類整數
性質
質因數分解
表示方式
189
算筹
希腊数字ΡΠΘ´
羅馬數字CLXXXIX
泰文数字๑๘๙在维基数据编辑
孟加拉数字১৮৯在维基数据编辑
印度數字१८९在维基数据编辑
摩尔斯电码· − − − − − − − · · − − − − ·在维基数据编辑
高棉數字១៨៩在维基数据编辑
二进制10111101(2)
三进制21000(3)
四进制2331(4)
五进制1224(5)
八进制275(8)
十二进制139(12)
十六进制BD(16)

189(一百八十九)是188190之間的自然數

數學領域

[编辑]
  • 合數正因數有1、3、7、9、21、27、63和189。
    質因數分解
  • 虧數真因數和為131,虧度為58。
  • 第88個十进制等數位數。前一個為185、下一個為191
  • 第9個七邊形數,也是是64邊形數。
  • 第5個中心立方數英语Centered cube numberCentered cube number),是二連續立方數的和,
  • 第37個幸運數
  • 烏拉姆數列的第40項。
  • 二進制為10111101,是迴文數,也是黑洞數
  • 可表示為二立方數的差,
  • 有{p, p+2, p+6, p+8}形式四胞胎质数中,除了{5, 7, 11, 13}外,其他四胞胎质数均可表示為{10n+1, 10n+3, 10n+7, 10n+9},乘積最後三位數均為189,例如11 × 13 × 17 × 19 = 46189,101 × 103 × 107 × 109 = 121330189。
  • 相反數-189為殭屍數,即位數和(首位含負號)的平方與自身的和大於零的負數,即。前一個為-197,後一個為-188(OEIS數列A328933)。
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189
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