Base | Representation |
---|---|
bin | 10110100001010… |
… | …11011000110001 |
3 | 111011111012102122 |
4 | 23100223120301 |
5 | 341330441033 |
6 | 30425124025 |
7 | 4452543143 |
oct | 1320533061 |
9 | 434435378 |
10 | 188921393 |
11 | 97706491 |
12 | 53329615 |
13 | 301a880b |
14 | 1b13ac93 |
15 | 118bba98 |
hex | b42b631 |
188921393 has 2 divisors, whose sum is σ = 188921394. Its totient is φ = 188921392.
The previous prime is 188921387. The next prime is 188921437. The reversal of 188921393 is 393129881.
It is an a-pointer prime, because the next prime (188921437) can be obtained adding 188921393 to its sum of digits (44).
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 187772209 + 1149184 = 13703^2 + 1072^2 .
It is an emirp because it is prime and its reverse (393129881) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 188921393 - 24 = 188921377 is a prime.
It is not a weakly prime, because it can be changed into another prime (188921303) 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, 94460696 + 94460697.
It is an arithmetic number, because the mean of its divisors is an integer number (94460697).
Almost surely, 2188921393 is an apocalyptic number.
It is an amenable number.
188921393 is a deficient number, since it is larger than the sum of its proper divisors (1).
188921393 is an equidigital number, since it uses as much as digits as its factorization.
188921393 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 93312, while the sum is 44.
The square root of 188921393 is about 13744.8678785938. The cubic root of 188921393 is about 573.7997830682.
The spelling of 188921393 in words is "one hundred eighty-eight million, nine hundred twenty-one thousand, three hundred ninety-three".
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