Base | Representation |
---|---|
bin | 100110011101001 |
3 | 1000000020 |
4 | 10303221 |
5 | 1112224 |
6 | 231053 |
7 | 111255 |
oct | 46351 |
9 | 30006 |
10 | 19689 |
11 | 1387a |
12 | b489 |
13 | 8c67 |
14 | 7265 |
15 | 5c79 |
hex | 4ce9 |
19689 has 4 divisors (see below), whose sum is σ = 26256. Its totient is φ = 13124.
The previous prime is 19687. The next prime is 19697. The reversal of 19689 is 98691.
It is a happy number.
19689 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.
It is a cyclic number.
It is not a de Polignac number, because 19689 - 21 = 19687 is a prime.
It is a D-number.
It is a plaindrome in base 5 and base 7.
It is not an unprimeable number, because it can be changed into a prime (19681) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3279 + ... + 3284.
It is an arithmetic number, because the mean of its divisors is an integer number (6564).
219689 is an apocalyptic number.
It is an amenable number.
19689 is a deficient number, since it is larger than the sum of its proper divisors (6567).
19689 is an equidigital number, since it uses as much as digits as its factorization.
19689 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 6566.
The product of its digits is 3888, while the sum is 33.
The square root of 19689 is about 140.3174971271. The cubic root of 19689 is about 27.0027432055.
The spelling of 19689 in words is "nineteen thousand, six hundred eighty-nine".
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