| Base | Representation |
|---|---|
| bin | 100100001010100… |
| … | …1101101100000000 |
| 3 | 10010120110020100220 |
| 4 | 1020111031230000 |
| 5 | 4441130130030 |
| 6 | 320225543040 |
| 7 | 42033520023 |
| oct | 11025155400 |
| 9 | 3116406326 |
| 10 | 1213520640 |
| 11 | 573001022 |
| 12 | 29a4a4a80 |
| 13 | 164549667 |
| 14 | b724d1ba |
| 15 | 7180ba10 |
| hex | 4854db00 |
1213520640 has 144 divisors (see below), whose sum is σ = 3931151616. Its totient is φ = 318976000.
The previous prime is 1213520629. The next prime is 1213520647. The reversal of 1213520640 is 460253121.
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 1213520640.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1213520647) 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 15 ways as a sum of consecutive naturals, for example, 270415 + ... + 274865.
It is an arithmetic number, because the mean of its divisors is an integer number (27299664).
Almost surely, 21213520640 is an apocalyptic number.
1213520640 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 1213520640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1965575808).
1213520640 is an abundant number, since it is smaller than the sum of its proper divisors (2717630976).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1213520640 is an equidigital number, since it uses as much as digits as its factorization.
1213520640 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 4546 (or 4532 counting only the distinct ones).
The product of its (nonzero) digits is 1440, while the sum is 24.
The square root of 1213520640 is about 34835.6231464287. The cubic root of 1213520640 is about 1066.6347351552.
Adding to 1213520640 its reverse (460253121), we get a palindrome (1673773761).
The spelling of 1213520640 in words is "one billion, two hundred thirteen million, five hundred twenty thousand, six hundred forty".
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