Base | Representation |
---|---|
bin | 100011000101… |
… | …0101100111001 |
3 | 1021121111201001 |
4 | 1012022230321 |
5 | 14202101123 |
6 | 1454125001 |
7 | 312226366 |
oct | 106125471 |
9 | 37544631 |
10 | 18393913 |
11 | a42368a |
12 | 61b0761 |
13 | 3a70395 |
14 | 262b46d |
15 | 19350ad |
hex | 118ab39 |
18393913 has 2 divisors, whose sum is σ = 18393914. Its totient is φ = 18393912.
The previous prime is 18393887. The next prime is 18393923. The reversal of 18393913 is 31939381.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 18207289 + 186624 = 4267^2 + 432^2 .
It is an emirp because it is prime and its reverse (31939381) is a distict prime.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-18393913 is a prime.
It is not a weakly prime, because it can be changed into another prime (18393923) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9196956 + 9196957.
It is an arithmetic number, because the mean of its divisors is an integer number (9196957).
Almost surely, 218393913 is an apocalyptic number.
It is an amenable number.
18393913 is a deficient number, since it is larger than the sum of its proper divisors (1).
18393913 is an equidigital number, since it uses as much as digits as its factorization.
18393913 is an evil number, because the sum of its binary digits is even.
The product of its digits is 17496, while the sum is 37.
The square root of 18393913 is about 4288.8125396198. The cubic root of 18393913 is about 263.9721092742.
It can be divided in two parts, 18393 and 913, that added together give a triangular number (19306 = T196).
The spelling of 18393913 in words is "eighteen million, three hundred ninety-three thousand, nine hundred thirteen".
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