19916 has 12 divisors (see below), whose sum is σ = 37632.
Its totient is φ = 9168.
The previous prime is 19913. The next prime is 19919. The reversal of 19916 is 61991.
It is an interprime number because it is at equal distance from previous prime (19913) and next prime (19919).
It is a Harshad number since it is a multiple of its sum of digits (26).
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, 140 + ... + 243.
It is an arithmetic number, because the mean of its divisors is an integer number (3136).
219916 is an apocalyptic number.
It is an amenable number.
19916 is a deficient number, since it is larger than the sum of its proper divisors (17716).
19916 is a wasteful number, since it uses less digits than its factorization.
19916 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 400 (or 398 counting only the distinct ones).
The product of its digits is 486, while the sum is 26.
The square root of 19916 is about 141.1240588985.
The cubic root of 19916 is about 27.1061209922.
Adding to 19916 its product of digits (486), we get a palindrome (20402).
The spelling of 19916 in words is "nineteen thousand, nine hundred sixteen".