Base | Representation |
---|---|
bin | 111011100110101… |
… | …100011001110010 |
3 | 2120200200012212100 |
4 | 323212230121302 |
5 | 4021444432330 |
6 | 243121241230 |
7 | 33531565146 |
oct | 7346543162 |
9 | 2520605770 |
10 | 999999090 |
11 | 473523132 |
12 | 23aa93216 |
13 | 12c23994c |
14 | 96b4b226 |
15 | 5cbd1060 |
hex | 3b9ac672 |
999999090 has 24 divisors (see below), whose sum is σ = 2599997868. Its totient is φ = 266666400.
The previous prime is 999999067. The next prime is 999999103. The reversal of 999999090 is 90999999.
It can be written as a sum of positive squares in 2 ways, for example, as 925193889 + 74805201 = 30417^2 + 8649^2 .
It is a Curzon number.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5555461 + ... + 5555640.
Almost surely, 2999999090 is an apocalyptic number.
999999090 is a gapful number since it is divisible by the number (90) formed by its first and last digit.
999999090 is an abundant number, since it is smaller than the sum of its proper divisors (1599998778).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
999999090 is a wasteful number, since it uses less digits than its factorization.
999999090 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 11111114 (or 11111111 counting only the distinct ones).
The product of its (nonzero) digits is 4782969, while the sum is 63.
The square root of 999999090 is about 31622.7622133172. The cubic root of 999999090 is about 999.9996966666. Note that the first 3 decimals are identical.
The spelling of 999999090 in words is "nine hundred ninety-nine million, nine hundred ninety-nine thousand, ninety".
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