| Base | Representation |
|---|---|
| bin | 100100011100101… |
| … | …0101111101100000 |
| 3 | 10011020021102020100 |
| 4 | 1020321111331200 |
| 5 | 10001041213322 |
| 6 | 321204542400 |
| 7 | 42210154335 |
| oct | 11071257540 |
| 9 | 3136242210 |
| 10 | 1222991712 |
| 11 | 57838a858 |
| 12 | 2a16b1a00 |
| 13 | 1664b4547 |
| 14 | b85d698c |
| 15 | 7257cdac |
| hex | 48e55f60 |
1222991712 has 144 divisors (see below), whose sum is σ = 3629283840. Its totient is φ = 390168576.
The previous prime is 1222991711. The next prime is 1222991717. The reversal of 1222991712 is 2171992221.
It is a happy number.
It is a tau number, because it is divible by the number of its divisors (144).
It is a super-4 number, since 4×12229917124 (a number of 37 digits) contains 4444 as substring.
It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.
It is a Harshad number since it is a multiple of its sum of digits (36).
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1222991711) by changing a digit.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1060128 + ... + 1061280.
It is an arithmetic number, because the mean of its divisors is an integer number (25203360).
Almost surely, 21222991712 is an apocalyptic number.
1222991712 is a gapful number since it is divisible by the number (12) 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 1222991712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1814641920).
1222991712 is an abundant number, since it is smaller than the sum of its proper divisors (2406292128).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1222991712 is a wasteful number, since it uses less digits than its factorization.
1222991712 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1325 (or 1314 counting only the distinct ones).
The product of its digits is 9072, while the sum is 36.
The square root of 1222991712 is about 34971.2984031191. The cubic root of 1222991712 is about 1069.4024415521.
The spelling of 1222991712 in words is "one billion, two hundred twenty-two million, nine hundred ninety-one thousand, seven hundred twelve".
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