19912 has 16 divisors (see below), whose sum is σ = 39600. Its totient is φ = 9360.

The previous prime is 19891. The next prime is 19913. The reversal of 19912 is 21991.

It is not an unprimeable number, because it can be changed into a prime (19913) by changing a digit.

19912 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 87 + ... + 217.

It is an arithmetic number, because the mean of its divisors is an integer number (2475).

2¹⁹⁹¹² is an apocalyptic number.

It is an amenable number.

19912 is a deficient number, since it is larger than the sum of its proper divisors (19688).

19912 is a wasteful number, since it uses less digits than its factorization.

19912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156 (or 152 counting only the distinct ones).

The product of its digits is 162, while the sum is 22.

The square root of 19912 is about 141.1098862589. The cubic root of 19912 is about 27.1043061743.

The spelling of 19912 in words is "nineteen thousand, nine hundred twelve".