19688 has 16 divisors (see below), whose sum is σ = 38880.
Its totient is φ = 9328.
The previous prime is 19687. The next prime is 19697. The reversal of 19688 is 88691.
It can be divided in two parts, 19 and 688, that added together give a palindrome (707).
It is a plaindrome in base 5.
It is not an unprimeable number, because it can be changed into a prime (19681) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131 + ... + 237.
It is an arithmetic number, because the mean of its divisors is an integer number (2430).
219688 is an apocalyptic number.
It is an amenable number.
19688 is a deficient number, since it is larger than the sum of its proper divisors (19192).
19688 is a wasteful number, since it uses less digits than its factorization.
19688 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 136 (or 132 counting only the distinct ones).
The product of its digits is 3456, while the sum is 32.
The square root of 19688 is about 140.3139337343.
The cubic root of 19688 is about 27.0022860433.
The spelling of 19688 in words is "nineteen thousand, six hundred eighty-eight".