| Base | Representation |
|---|---|
| bin | 101111110111001… |
| … | …0011000111000100 |
| 3 | 11010220220212000000 |
| 4 | 1133232103013010 |
| 5 | 11242112104140 |
| 6 | 423205321300 |
| 7 | 54540353223 |
| oct | 13756230704 |
| 9 | 4126825000 |
| 10 | 1605972420 |
| 11 | 754590938 |
| 12 | 389a06230 |
| 13 | 1c7947350 |
| 14 | 11340acba |
| 15 | 95ecda30 |
| hex | 5fb931c4 |
1605972420 has 336 divisors, whose sum is σ = 5617058160. Its totient is φ = 382952448.
The previous prime is 1605972409. The next prime is 1605972421. The reversal of 1605972420 is 242795061.
1605972420 is a `hidden beast` number, since 1 + 60 + 597 + 2 + 4 + 2 + 0 = 666.
It can be written as a sum of positive squares in 8 ways, for example, as 77475204 + 1528497216 = 8802^2 + 39096^2 .
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 (1605972421) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 7012866 + ... + 7013094.
It is an arithmetic number, because the mean of its divisors is an integer number (16717435).
Almost surely, 21605972420 is an apocalyptic number.
1605972420 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 1605972420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2808529080).
1605972420 is an abundant number, since it is smaller than the sum of its proper divisors (4011085740).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1605972420 is a wasteful number, since it uses less digits than its factorization.
1605972420 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 306 (or 289 counting only the distinct ones).
The product of its (nonzero) digits is 30240, while the sum is 36.
The square root of 1605972420 is about 40074.5857121443. The cubic root of 1605972420 is about 1171.0605767838.
The spelling of 1605972420 in words is "one billion, six hundred five million, nine hundred seventy-two thousand, four hundred twenty".
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