| Base | Representation |
|---|---|
| bin | 11001101001010… |
| … | …00010000101010 |
| 3 | 112222210101021000 |
| 4 | 30310220100222 |
| 5 | 420032413421 |
| 6 | 33202455430 |
| 7 | 5221341501 |
| oct | 1464502052 |
| 9 | 488711230 |
| 10 | 215122986 |
| 11 | 1004820a1 |
| 12 | 60064576 |
| 13 | 35750910 |
| 14 | 207db838 |
| 15 | 13d45226 |
| hex | cd2842a |
215122986 has 64 divisors (see below), whose sum is σ = 532627200. Its totient is φ = 63903168.
The previous prime is 215122961. The next prime is 215122987. The reversal of 215122986 is 689221512.
215122986 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.
It is a self number, because there is not a number n which added to its sum of digits gives 215122986.
It is not an unprimeable number, because it can be changed into a prime (215122987) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15075 + ... + 25641.
It is an arithmetic number, because the mean of its divisors is an integer number (8322300).
Almost surely, 2215122986 is an apocalyptic number.
215122986 is a gapful number since it is divisible by the number (26) formed by its first and last digit.
It is a practical number, because each smaller number is the sum of distinct divisors of 215122986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (266313600).
215122986 is an abundant number, since it is smaller than the sum of its proper divisors (317504214).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
215122986 is a wasteful number, since it uses less digits than its factorization.
215122986 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 10620 (or 10614 counting only the distinct ones).
The product of its digits is 17280, while the sum is 36.
The square root of 215122986 is about 14667.0714868374. The cubic root of 215122986 is about 599.1868484722.
It can be divided in two parts, 215 and 122986, that added together give a square (123201 = 3512).
The spelling of 215122986 in words is "two hundred fifteen million, one hundred twenty-two thousand, nine hundred eighty-six".
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