| Base | Representation |
|---|---|
| bin | 100100010100111… |
| … | …1001100001101000 |
| 3 | 10010221122201120000 |
| 4 | 1020221321201220 |
| 5 | 4444022134310 |
| 6 | 320542103000 |
| 7 | 42130562625 |
| oct | 11051714150 |
| 9 | 3127581500 |
| 10 | 1218943080 |
| 11 | 576074a83 |
| 12 | 2a027aa60 |
| 13 | 1656c77c4 |
| 14 | b7c6134c |
| 15 | 7202d4c0 |
| hex | 48a79868 |
1218943080 has 160 divisors (see below), whose sum is σ = 4238605800. Its totient is φ = 313818624.
The previous prime is 1218943069. The next prime is 1218943087. The reversal of 1218943080 is 803498121.
1218943080 is a `hidden beast` number, since 1 + 218 + 9 + 430 + 8 + 0 = 666.
It can be written as a sum of positive squares in 4 ways, for example, as 575712036 + 643231044 = 23994^2 + 25362^2 .
It is a super-3 number, since 3×12189430803 (a number of 28 digits) contains 333 as substring.
It is a Harshad number since it is a multiple of its sum of digits (36).
It is not an unprimeable number, because it can be changed into a prime (1218943087) 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 39 ways as a sum of consecutive naturals, for example, 87474 + ... + 100446.
Almost surely, 21218943080 is an apocalyptic number.
1218943080 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 1218943080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2119302900).
1218943080 is an abundant number, since it is smaller than the sum of its proper divisors (3019662720).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1218943080 is a wasteful number, since it uses less digits than its factorization.
1218943080 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 13025 (or 13012 counting only the distinct ones).
The product of its (nonzero) digits is 13824, while the sum is 36.
The square root of 1218943080 is about 34913.3653491038. The cubic root of 1218943080 is about 1068.2210753050.
The spelling of 1218943080 in words is "one billion, two hundred eighteen million, nine hundred forty-three thousand, eighty".
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