| Base | Representation |
|---|---|
| bin | 110000110110… |
| … | …010000000000 |
| 3 | 220002120022201 |
| 4 | 300312100000 |
| 5 | 11234230440 |
| 6 | 1134242544 |
| 7 | 213561466 |
| oct | 60662000 |
| 9 | 26076281 |
| 10 | 12805120 |
| 11 | 7256749 |
| 12 | 4356454 |
| 13 | 28645c3 |
| 14 | 19b4836 |
| 15 | 11ce19a |
| hex | c36400 |
12805120 has 88 divisors (see below), whose sum is σ = 31982328. Its totient is φ = 4915200.
The previous prime is 12805087. The next prime is 12805127. The reversal of 12805120 is 2150821.
It can be written as a sum of positive squares in 4 ways, for example, as 861184 + 11943936 = 928^2 + 3456^2 .
It is a hoax number, since the sum of its digits (19) coincides with the sum of the digits of its distinct prime factors.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (12805127) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 209890 + ... + 209950.
Almost surely, 212805120 is an apocalyptic number.
12805120 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 12805120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15991164).
12805120 is an abundant number, since it is smaller than the sum of its proper divisors (19177208).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
12805120 is an equidigital number, since it uses as much as digits as its factorization.
12805120 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 127 (or 109 counting only the distinct ones).
The product of its (nonzero) digits is 160, while the sum is 19.
The square root of 12805120 is about 3578.4242342126. The cubic root of 12805120 is about 233.9526044219.
Adding to 12805120 its reverse (2150821), we get a palindrome (14955941).
It can be divided in two parts, 1280 and 5120, that multiplied together give a square (6553600 = 25602).
The spelling of 12805120 in words is "twelve million, eight hundred five thousand, one hundred twenty".
• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.000 sec. • engine limits •