| Base | Representation |
|---|---|
| bin | 100100101100000… |
| … | …1001100111111000 |
| 3 | 10011210110201022210 |
| 4 | 1021120021213320 |
| 5 | 10010123131030 |
| 6 | 322054015120 |
| 7 | 42335621325 |
| oct | 11130114770 |
| 9 | 3153421283 |
| 10 | 1231067640 |
| 11 | 5819a6380 |
| 12 | 2a43474a0 |
| 13 | 1680813ba |
| 14 | b96d9b4c |
| 15 | 73125bb0 |
| hex | 496099f8 |
1231067640 has 384 divisors, whose sum is σ = 4414798080. Its totient is φ = 272025600.
The previous prime is 1231067633. The next prime is 1231067647. The reversal of 1231067640 is 467601321.
It is an interprime number because it is at equal distance from previous prime (1231067633) and next prime (1231067647).
It is a Harshad number since it is a multiple of its sum of digits (30).
It is a junction number, because it is equal to n+sod(n) for n = 1231067598 and 1231067607.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1231067647) by changing a digit.
It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 28629459 + ... + 28629501.
It is an arithmetic number, because the mean of its divisors is an integer number (11496870).
Almost surely, 21231067640 is an apocalyptic number.
1231067640 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 1231067640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2207399040).
1231067640 is an abundant number, since it is smaller than the sum of its proper divisors (3183730440).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1231067640 is a wasteful number, since it uses less digits than its factorization.
1231067640 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 155 (or 128 counting only the distinct ones).
The product of its (nonzero) digits is 6048, while the sum is 30.
The square root of 1231067640 is about 35086.5735004147. The cubic root of 1231067640 is about 1071.7511837136.
Adding to 1231067640 its reverse (467601321), we get a palindrome (1698668961).
The spelling of 1231067640 in words is "one billion, two hundred thirty-one million, sixty-seven thousand, six hundred forty".
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