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40

39 ← 40 → 41
읽는 법사십
세는 법마흔
한자四十(卌)
소인수 분해23× 5
로마 숫자XL
2진수1010002
3진수11113
4진수2204
5진수1305
6진수1046
8진수508
12진수3412
16진수2816
20진수2020
36진수1436
φ(40)16
σ*(40)54
d(40)8
σ(40)90
μ(40)0
M(40)0
수 목록 · 정수

40(사십)은 39보다 크고 41보다 작은 자연수이다.

수학

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과학

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나이(만 40세)

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  • 40세는 논어 위정편 가운데 ‘마흔에 흔들리지 않았다(四十不惑)’라는 구절을 인용하여 불혹이라고도 한다.
  • 대한민국 대통령출마 피선거권 부여 연령.
  • 필즈상 수상자의 나이 상한.

방송

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기타

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같이 보기

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40
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