Base | Representation |
---|---|
bin | 100011010110… |
… | …0001010101101 |
3 | 1021212110201221 |
4 | 1012230022231 |
5 | 14220442424 |
6 | 1501103341 |
7 | 313340131 |
oct | 106541255 |
9 | 37773657 |
10 | 18530989 |
11 | a507674 |
12 | 6257b51 |
13 | 3aba8a9 |
14 | 26653c1 |
15 | 19609e4 |
hex | 11ac2ad |
18530989 has 2 divisors, whose sum is σ = 18530990. Its totient is φ = 18530988.
The previous prime is 18530959. The next prime is 18531017. The reversal of 18530989 is 98903581.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 15468489 + 3062500 = 3933^2 + 1750^2 .
It is a cyclic number.
It is not a de Polignac number, because 18530989 - 27 = 18530861 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (18530959) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9265494 + 9265495.
It is an arithmetic number, because the mean of its divisors is an integer number (9265495).
Almost surely, 218530989 is an apocalyptic number.
It is an amenable number.
18530989 is a deficient number, since it is larger than the sum of its proper divisors (1).
18530989 is an equidigital number, since it uses as much as digits as its factorization.
18530989 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 77760, while the sum is 43.
The square root of 18530989 is about 4304.7635242833. The cubic root of 18530989 is about 264.6262156354.
The spelling of 18530989 in words is "eighteen million, five hundred thirty thousand, nine hundred eighty-nine".
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