| Base | Representation |
|---|---|
| bin | 100100001000000… |
| … | …0000000000000000 |
| 3 | 10010110212210111021 |
| 4 | 1020100000000000 |
| 5 | 4440302410411 |
| 6 | 320140355224 |
| 7 | 42016065154 |
| oct | 11020000000 |
| 9 | 3113783437 |
| 10 | 1212153856 |
| 11 | 572258151 |
| 12 | 299b45b14 |
| 13 | 16418b504 |
| 14 | b6db5064 |
| 15 | 7163ba71 |
| hex | 48400000 |
1212153856 has 69 divisors (see below), whose sum is σ = 2575302349. Its totient is φ = 570425344.
The previous prime is 1212153827. The next prime is 1212153857. The reversal of 1212153856 is 6583512121.
The square root of 1212153856 is 34816.
It is a perfect power (a square), and thus also a powerful number.
It can be written as a sum of positive squares in only one way, i.e., 943718400 + 268435456 = 30720^2 + 16384^2 .
It is a Harshad number since it is a multiple of its sum of digits (34).
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (1212153857) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (3) of ones.
It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 71303160 + ... + 71303176.
Almost surely, 21212153856 is an apocalyptic number.
1212153856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.
1212153856 is the 34816-th square number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 1212153856
1212153856 is an abundant number, since it is smaller than the sum of its proper divisors (1363148493).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1212153856 is an frugal number, since it uses more digits than its factorization.
1212153856 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 78 (or 19 counting only the distinct ones).
The product of its digits is 14400, while the sum is 34.
The cubic root of 1212153856 is about 1066.2341357445.
Multiplying 1212153856 by its product of digits (14400), we get a square (17455015526400 = 41779202).
Adding to 1212153856 its reverse (6583512121), we get a palindrome (7795665977).
The spelling of 1212153856 in words is "one billion, two hundred twelve million, one hundred fifty-three thousand, eight hundred fifty-six".
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