Numbers 390,000s

A page of the Numeropedia - the Special Encyclopedia of Numbers

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390,000

[EECS]  390K(W) is one of standard numerical values for resistors (of tolerance class 5%).

390,313

[Math.]  152,344,237,969 = (152,344+237,969)2 = 390,3132 and 371,718,237,969 = (371,718+237,969)2 = 609,6872 and 390313+609687 = 1,000,000.

390,625

[Math.]  390,625 = (3+9+0+6+2+5)4 = 254.

[Math.]  Its odd powers end with 390,625. Its even powers end with 890,625.

391,939 & 393,919

[Math.]  Circular prime numbers: all 6 numbers 193939, 939391, 393919, 939193, 391939 and 919393 are prime.

396,900

[Math.]  Sum of the first 35 cube numbers:

13+23+…+343+353 = 396,900 = (1+2+…+34+35)2 = 6302.

[Math.]  Sum (in degrees) of all internal angles of a 2,207-side polygon.

397,047

[Math.]  Two consecutive sums of consecutive numbers: 5329+…+5402 = 5403+…+5475 = 397,047.

397,442

[Math.]  The sum s(n) = 2^(2n)+3^(2n)+5^(2n) is always divisible by 19 for any integer n > 0: s(3) = 28+38+58 = 397442 = 19´20918.

399,001

[Math.]  A Carmichael number: 399,001 = 31×61×211.

399,592

[Math.]  A pair of amicable numbers (356408, 399592).