Base | Representation |
---|---|
bin | 100100000111… |
… | …1101110100101 |
3 | 1022122012010122 |
4 | 1020033232211 |
5 | 14322020124 |
6 | 1513531325 |
7 | 316656062 |
oct | 110175645 |
9 | 38565118 |
10 | 18938789 |
11 | a765aa1 |
12 | 6413b45 |
13 | 3c013ac |
14 | 272dc69 |
15 | 19e175e |
hex | 120fba5 |
18938789 has 2 divisors, whose sum is σ = 18938790. Its totient is φ = 18938788.
The previous prime is 18938771. The next prime is 18938809. The reversal of 18938789 is 98783981.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 12837889 + 6100900 = 3583^2 + 2470^2 .
It is an emirp because it is prime and its reverse (98783981) is a distict prime.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-18938789 is a prime.
It is a self number, because there is not a number n which added to its sum of digits gives 18938789.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (18938719) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9469394 + 9469395.
It is an arithmetic number, because the mean of its divisors is an integer number (9469395).
Almost surely, 218938789 is an apocalyptic number.
It is an amenable number.
18938789 is a deficient number, since it is larger than the sum of its proper divisors (1).
18938789 is an equidigital number, since it uses as much as digits as its factorization.
18938789 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 870912, while the sum is 53.
The square root of 18938789 is about 4351.8718960925. The cubic root of 18938789 is about 266.5533030297.
The spelling of 18938789 in words is "eighteen million, nine hundred thirty-eight thousand, seven hundred eighty-nine".
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