Base | Representation |
---|---|
bin | 11000101111111101001 |
3 | 1112012110111 |
4 | 3011333221 |
5 | 201422420 |
6 | 25214321 |
7 | 6615250 |
oct | 3057751 |
9 | 1465414 |
10 | 810985 |
11 | 50433a |
12 | 3313a1 |
13 | 225196 |
14 | 171797 |
15 | 11045a |
hex | c5fe9 |
810985 has 32 divisors (see below), whose sum is σ = 1244160. Its totient is φ = 494592.
The previous prime is 810973. The next prime is 810989. The reversal of 810985 is 589018.
It is not a de Polignac number, because 810985 - 29 = 810473 is a prime.
It is an alternating number because its digits alternate between even and odd.
It is not an unprimeable number, because it can be changed into a prime (810989) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17232 + ... + 17278.
It is an arithmetic number, because the mean of its divisors is an integer number (38880).
2810985 is an apocalyptic number.
810985 is a gapful number since it is divisible by the number (85) formed by its first and last digit.
It is an amenable number.
810985 is a deficient number, since it is larger than the sum of its proper divisors (433175).
810985 is a wasteful number, since it uses less digits than its factorization.
810985 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 105.
The product of its (nonzero) digits is 2880, while the sum is 31.
The square root of 810985 is about 900.5470559610. The cubic root of 810985 is about 93.2547453543.
The spelling of 810985 in words is "eight hundred ten thousand, nine hundred eighty-five".
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