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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".