40
40是39搭41之间个自然数。
- 第27个合数，正约数有1、2、4、5、8、10、20搭40。前一个为39、下一个为42。
- 第19个十进制个哈沙德数。前一个为36、下一个为42。
- 第18个十进制个奢侈数。前一个为39、下一个为42。
- 锆个原子序数。
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