| Base | Representation |
|---|---|
| bin | 100101000001010… |
| … | …0111100111001000 |
| 3 | 10012120102022202200 |
| 4 | 1022002213213020 |
| 5 | 10021000404040 |
| 6 | 323132400200 |
| 7 | 42532346601 |
| oct | 11202474710 |
| 9 | 3176368680 |
| 10 | 1242200520 |
| 11 | 58820a700 |
| 12 | 2a8016060 |
| 13 | 16a47b7c2 |
| 14 | bad96da8 |
| 15 | 740c4630 |
| hex | 4a0a79c8 |
1242200520 has 144 divisors (see below), whose sum is σ = 4437685980. Its totient is φ = 301128960.
The previous prime is 1242200507. The next prime is 1242200543. The reversal of 1242200520 is 250022421.
1242200520 is a `hidden beast` number, since 124 + 2 + 20 + 0 + 520 = 666.
It can be written as a sum of positive squares in 2 ways, for example, as 1218987396 + 23213124 = 34914^2 + 4818^2 .
It is a Harshad number since it is a multiple of its sum of digits (18).
It is a junction number, because it is equal to n+sod(n) for n = 1242200493 and 1242200502.
It is an unprimeable number.
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 35 ways as a sum of consecutive naturals, for example, 29302 + ... + 57818.
Almost surely, 21242200520 is an apocalyptic number.
1242200520 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 1242200520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2218842990).
1242200520 is an abundant number, since it is smaller than the sum of its proper divisors (3195485460).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1242200520 is a wasteful number, since it uses less digits than its factorization.
1242200520 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 28556 (or 28538 counting only the distinct ones).
The product of its (nonzero) digits is 320, while the sum is 18.
The square root of 1242200520 is about 35244.8651579205. The cubic root of 1242200520 is about 1074.9722062401.
Adding to 1242200520 its reverse (250022421), we get a palindrome (1492222941).
The spelling of 1242200520 in words is "one billion, two hundred forty-two million, two hundred thousand, five hundred twenty".
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