| Base | Representation |
|---|---|
| bin | 100100101100010… |
| … | …1111011000110000 |
| 3 | 10011210202120111200 |
| 4 | 1021120233120300 |
| 5 | 10010143103240 |
| 6 | 322101211200 |
| 7 | 42340134306 |
| oct | 11130573060 |
| 9 | 3153676450 |
| 10 | 1231222320 |
| 11 | 581aa1609 |
| 12 | 2a4400b00 |
| 13 | 168106923 |
| 14 | b973a276 |
| 15 | 73156930 |
| hex | 4962f630 |
1231222320 has 120 divisors (see below), whose sum is σ = 4176040752. Its totient is φ = 325056000.
The previous prime is 1231222283. The next prime is 1231222339. The reversal of 1231222320 is 232221321.
1231222320 is a `hidden beast` number, since 12 + 312 + 22 + 320 = 666.
It is a tau number, because it is divible by the number of its divisors (120).
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 = 1231222293 and 1231222302.
It is an unprimeable number.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64255 + ... + 81185.
Almost surely, 21231222320 is an apocalyptic number.
1231222320 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 1231222320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2088020376).
1231222320 is an abundant number, since it is smaller than the sum of its proper divisors (2944818432).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1231222320 is a wasteful number, since it uses less digits than its factorization.
1231222320 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 17051 (or 17042 counting only the distinct ones).
The product of its (nonzero) digits is 288, while the sum is 18.
The square root of 1231222320 is about 35088.7776931600. Note that the first 3 decimals coincide. The cubic root of 1231222320 is about 1071.7960692869.
Adding to 1231222320 its reverse (232221321), we get a palindrome (1463443641).
Subtracting from 1231222320 its reverse (232221321), we obtain a palindrome (999000999).
The spelling of 1231222320 in words is "one billion, two hundred thirty-one million, two hundred twenty-two thousand, three hundred twenty".
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