| Base | Representation |
|---|---|
| bin | 101001011110011… |
| … | …0110110100000100 |
| 3 | 10120222200220202000 |
| 4 | 1102330312310010 |
| 5 | 10322232403433 |
| 6 | 350032345300 |
| 7 | 46326061200 |
| oct | 12274666404 |
| 9 | 3528626660 |
| 10 | 1391684868 |
| 11 | 65462a492 |
| 12 | 32a0a5230 |
| 13 | 192429a92 |
| 14 | d2b89b00 |
| 15 | 822a1113 |
| hex | 52f36d04 |
1391684868 has 144 divisors (see below), whose sum is σ = 4418366400. Its totient is φ = 376669440.
The previous prime is 1391684867. The next prime is 1391684869. The reversal of 1391684868 is 8684861931.
1391684868 is a `hidden beast` number, since 13 + 91 + 68 + 486 + 8 = 666.
It is an interprime number because it is at equal distance from previous prime (1391684867) and next prime (1391684869).
It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.
It is a Harshad number since it is a multiple of its sum of digits (54).
It is not an unprimeable number, because it can be changed into a prime (1391684867) by changing a digit.
It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 93628 + ... + 107468.
It is an arithmetic number, because the mean of its divisors is an integer number (30683100).
Almost surely, 21391684868 is an apocalyptic number.
1391684868 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 1391684868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2209183200).
1391684868 is an abundant number, since it is smaller than the sum of its proper divisors (3026681532).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1391684868 is a wasteful number, since it uses less digits than its factorization.
1391684868 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 13887 (or 13872 counting only the distinct ones).
The product of its digits is 1990656, while the sum is 54.
The square root of 1391684868 is about 37305.2927612155. The cubic root of 1391684868 is about 1116.4697698533.
The spelling of 1391684868 in words is "one billion, three hundred ninety-one million, six hundred eighty-four thousand, eight hundred sixty-eight".
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