Numbers 180,000s

A page of the Numeropedia - the Special Encyclopedia of Numbers

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180,000

[EECS]  180K(W) is one of standard numerical values for resistors (of tolerance class 5%).

[Math.]  Sum (in degrees) of all internal angles of a 1002-side polygon.

180,348

[Math.]  Two consecutive sums of consecutive numbers: 3136+…+3192 = 3193+…+3248 = 180,348.

180,848

[Math.]  A pair of amicable numbers (176272, 180848).

181,819

[Math.]  33,058,148,761 = (33,058+148,761)2 = 181,8192 and 669,420,148,761 = (669420+148761)2 = 818,1812 and 181819+818181 = 1,000,000.

183,184

[Math.]  A square number 4282 = 183,184, formed by concatenation of 2 consecutive numbers. (The smallest such case).

183,186

[Math.]  The 30th Keith number.

185,368

[Math.]  A pair of amicable numbers (185368, 203432).

185,472

[Math.]  185,472 = 672×276 = 384×483.

186,282

[Science]  The speed (miles/second) of light in vacuum, (equal to 299,792.458 km/sec).

187,110

[Math.]  35,010,152,100 = (35010+152,100)2 = 187,1102 and

660,790,152,100 = (660790+152100)2 = 812,8902 and 187110+812890 = 1,000,000.

188,356

[Math.]  (454+545 = 999 = 434+565)

4542 = 206,116 & 206+116 = 322

5452 = 297,025 & 297+025 = 322

and

4342 = 188,356 & 188+356 = 544

5652 = 319,225 & 319+225 = 544.

188,461

[Math.]  A Carmichael number: 188,461 = 7×13×19×109.

189,225

[Math.]  Sum of the first 29 cube numbers:

13+23+33+…+273+283+293 = 189,225 = (1+2+3+…+27+28+29)2 = 4352.