| Base | Representation |
|---|---|
| bin | 101001011000101… |
| … | …0110000100100000 |
| 3 | 10120210000121020100 |
| 4 | 1102301112010200 |
| 5 | 10320444322133 |
| 6 | 345443542400 |
| 7 | 46261322220 |
| oct | 12261260440 |
| 9 | 3523017210 |
| 10 | 1388667168 |
| 11 | 652959219 |
| 12 | 32908aa00 |
| 13 | 191911365 |
| 14 | d2602080 |
| 15 | 81da6e13 |
| hex | 52c56120 |
1388667168 has 144 divisors (see below), whose sum is σ = 4778766720. Its totient is φ = 373413888.
The previous prime is 1388667127. The next prime is 1388667169. The reversal of 1388667168 is 8617668831.
It is a tau number, because it is divible by the number of its divisors (144).
It is a super-2 number, since 2×13886671682 = 3856793006962280448, which contains 22 as substring.
It is a nude number because it is divisible by every one of its digits.
It is not an unprimeable number, because it can be changed into a prime (1388667169) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14013 + ... + 54531.
It is an arithmetic number, because the mean of its divisors is an integer number (33185880).
Almost surely, 21388667168 is an apocalyptic number.
1388667168 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 1388667168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2389383360).
1388667168 is an abundant number, since it is smaller than the sum of its proper divisors (3390099552).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1388667168 is a wasteful number, since it uses less digits than its factorization.
1388667168 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 40559 (or 40548 counting only the distinct ones).
The product of its digits is 2322432, while the sum is 54.
The square root of 1388667168 is about 37264.8248083900. The cubic root of 1388667168 is about 1115.6622094032.
The spelling of 1388667168 in words is "one billion, three hundred eighty-eight million, six hundred sixty-seven thousand, one hundred sixty-eight".
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