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999855990 = 232572516323
BaseRepresentation
bin111011100110001…
…001011101110110
32120200101221120100
4323212021131312
54021430342430
6243114214530
733530431020
oct7346113566
92520357510
10999855990
11473435671
1223aa24446
1312c1b9783
1496b11010
155cba3960
hex3b989776

999855990 has 96 divisors (see below), whose sum is σ = 2983309056. Its totient is φ = 227592000.

The previous prime is 999855973. The next prime is 999855991. The reversal of 999855990 is 99558999.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999855991) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 154969 + ... + 161291.

It is an arithmetic number, because the mean of its divisors is an integer number (31076136).

Almost surely, 2999855990 is an apocalyptic number.

999855990 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 999855990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1491654528).

999855990 is an abundant number, since it is smaller than the sum of its proper divisors (1983453066).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

999855990 is a wasteful number, since it uses less digits than its factorization.

999855990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6594 (or 6591 counting only the distinct ones).

The product of its (nonzero) digits is 11809800, while the sum is 63.

The square root of 999855990 is about 31620.4995216711. The cubic root of 999855990 is about 999.9519943622.

The spelling of 999855990 in words is "nine hundred ninety-nine million, eight hundred fifty-five thousand, nine hundred ninety".

Divisors: 1 2 3 5 6 7 9 10 14 15 18 21 30 35 42 45 63 70 90 105 126 210 251 315 502 630 753 1255 1506 1757 2259 2510 3514 3765 4518 5271 6323 7530 8785 10542 11295 12646 15813 17570 18969 22590 26355 31615 31626 37938 44261 52710 56907 63230 79065 88522 94845 113814 132783 158130 189690 221305 265566 284535 398349 442610 569070 663915 796698 1327830 1587073 1991745 3174146 3983490 4761219 7935365 9522438 11109511 14283657 15870730 22219022 23806095 28567314 33328533 47612190 55547555 66657066 71418285 99985599 111095110 142836570 166642665 199971198 333285330 499927995 999855990