| Base | Representation |
|---|---|
| bin | 100100011101111… |
| … | …0011110001110000 |
| 3 | 10011021111020221200 |
| 4 | 1020323303301300 |
| 5 | 10001222410003 |
| 6 | 321230451200 |
| 7 | 42215516046 |
| oct | 11073636160 |
| 9 | 3137436850 |
| 10 | 1223638128 |
| 11 | 578791489 |
| 12 | 2a1963b00 |
| 13 | 16667c83b |
| 14 | b8724396 |
| 15 | 726596a3 |
| hex | 48ef3c70 |
1223638128 has 120 divisors (see below), whose sum is σ = 3486078960. Its totient is φ = 400619520.
The previous prime is 1223638109. The next prime is 1223638147. The reversal of 1223638128 is 8218363221.
1223638128 is a `hidden beast` number, since 1 + 2 + 2 + 3 + 638 + 12 + 8 = 666.
It is an interprime number because it is at equal distance from previous prime (1223638109) and next prime (1223638147).
It is a Harshad number since it is a multiple of its sum of digits (36).
It is a nude number because it is divisible by every one of its digits.
It is a junction number, because it is equal to n+sod(n) for n = 1223638092 and 1223638101.
It is a congruent number.
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, 2261538 + ... + 2262078.
It is an arithmetic number, because the mean of its divisors is an integer number (29050658).
Almost surely, 21223638128 is an apocalyptic number.
1223638128 is a gapful number since it is divisible by the number (18) 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 1223638128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1743039480).
1223638128 is an abundant number, since it is smaller than the sum of its proper divisors (2262440832).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1223638128 is a wasteful number, since it uses less digits than its factorization.
1223638128 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 807 (or 798 counting only the distinct ones).
The product of its digits is 27648, while the sum is 36.
The square root of 1223638128 is about 34980.5392754314. The cubic root of 1223638128 is about 1069.5908203408.
The spelling of 1223638128 in words is "one billion, two hundred twenty-three million, six hundred thirty-eight thousand, one hundred twenty-eight".
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