| Base | Representation |
|---|---|
| bin | 100101000011001… |
| … | …1010111100100000 |
| 3 | 10012122021221222100 |
| 4 | 1022012122330200 |
| 5 | 10021224302331 |
| 6 | 323210010400 |
| 7 | 42544000452 |
| oct | 11206327440 |
| 9 | 3178257870 |
| 10 | 1243197216 |
| 11 | 588830518 |
| 12 | 2a8416a00 |
| 13 | 16a73a371 |
| 14 | bb1762d2 |
| 15 | 7421eae6 |
| hex | 4a19af20 |
1243197216 has 144 divisors (see below), whose sum is σ = 3864526848. Its totient is φ = 377395200.
The previous prime is 1243197169. The next prime is 1243197217. The reversal of 1243197216 is 6127913421.
1243197216 is a `hidden beast` number, since 1 + 2 + 431 + 9 + 7 + 216 = 666.
It is a tau number, because it is divible by the number of its divisors (144).
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 (1243197217) by changing a digit.
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 23 ways as a sum of consecutive naturals, for example, 147681 + ... + 155871.
It is an arithmetic number, because the mean of its divisors is an integer number (26836992).
Almost surely, 21243197216 is an apocalyptic number.
1243197216 is a gapful number since it is divisible by the number (16) 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 1243197216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1932263424).
1243197216 is an abundant number, since it is smaller than the sum of its proper divisors (2621329632).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1243197216 is a wasteful number, since it uses less digits than its factorization.
1243197216 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 8255 (or 8244 counting only the distinct ones).
The product of its digits is 18144, while the sum is 36.
The square root of 1243197216 is about 35259.0019144048. The cubic root of 1243197216 is about 1075.2596354306.
The spelling of 1243197216 in words is "one billion, two hundred forty-three million, one hundred ninety-seven thousand, two hundred sixteen".
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