19981132 has 6 divisors (see below), whose sum is σ = 34966988. Its totient is φ = 9990564.

The previous prime is 19981109. The next prime is 19981139. The reversal of 19981132 is 23118991.

It is not an unprimeable number, because it can be changed into a prime (19981139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2497638 + ... + 2497645.

Almost surely, 2^19981132 is an apocalyptic number.

It is an amenable number.

19981132 is a deficient number, since it is larger than the sum of its proper divisors (14985856).

19981132 is a wasteful number, since it uses less digits than its factorization.

19981132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4995287 (or 4995285 counting only the distinct ones).

The product of its digits is 3888, while the sum is 34.

The square root of 19981132 is about 4470.0259507077. The cubic root of 19981132 is about 271.3563754167.

The spelling of 19981132 in words is "nineteen million, nine hundred eighty-one thousand, one hundred thirty-two".