| Base | Representation |
|---|---|
| bin | 1111010010011… |
| … | …01010101100000 |
| 3 | 22221022102101020 |
| 4 | 13221031111200 |
| 5 | 230312234130 |
| 6 | 20420405440 |
| 7 | 3115022262 |
| oct | 751152540 |
| 9 | 287272336 |
| 10 | 128243040 |
| 11 | 66431992 |
| 12 | 36b46880 |
| 13 | 20751b73 |
| 14 | 13063b32 |
| 15 | b3d2e10 |
| hex | 7a4d560 |
128243040 has 144 divisors (see below), whose sum is σ = 417466224. Its totient is φ = 33080320.
The previous prime is 128243029. The next prime is 128243047. The reversal of 128243040 is 40342821.
It is a Harshad number since it is a multiple of its sum of digits (24).
It is a self number, because there is not a number n which added to its sum of digits gives 128243040.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (128243047) 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 23 ways as a sum of consecutive naturals, for example, 1806205 + ... + 1806275.
It is an arithmetic number, because the mean of its divisors is an integer number (2899071).
Almost surely, 2128243040 is an apocalyptic number.
128243040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 128243040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (208733112).
128243040 is an abundant number, since it is smaller than the sum of its proper divisors (289223184).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
128243040 is an equidigital number, since it uses as much as digits as its factorization.
128243040 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 213 (or 134 counting only the distinct ones).
The product of its (nonzero) digits is 1536, while the sum is 24.
The square root of 128243040 is about 11324.4443572301. Note that the first 3 decimals coincide. The cubic root of 128243040 is about 504.2871883017.
Adding to 128243040 its reverse (40342821), we get a palindrome (168585861).
The spelling of 128243040 in words is "one hundred twenty-eight million, two hundred forty-three thousand, forty".
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