19983 has 4 divisors (see below), whose sum is σ = 26648. Its totient is φ = 13320.
The previous prime is 19979. The next prime is 19991. The reversal of 19983 is 38991.
It is a happy number.
It is a semiprime because it is the product of two primes.
It is not a de Polignac number, because 19983 - 22 = 19979 is a prime.
It is a D-number.
It is a Duffinian number.
It is a self number, because there is not a number n which added to its sum of digits gives 19983.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (19913) 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, 3328 + ... + 3333.
It is an arithmetic number, because the mean of its divisors is an integer number (6662).
219983 is an apocalyptic number.
19983 is a deficient number, since it is larger than the sum of its proper divisors (6665).
19983 is an equidigital number, since it uses as much as digits as its factorization.
19983 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 6664.
The product of its digits is 1944, while the sum is 30.
The square root of 19983 is about 141.3612393834. The cubic root of 19983 is about 27.1364831359.
It can be divided in two parts, 199 and 83, that added together give a palindrome (282).
The spelling of 19983 in words is "nineteen thousand, nine hundred eighty-three".
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