19989172 has 24 divisors (see below), whose sum is σ = 41269760. Its totient is φ = 8290080.

The previous prime is 19989163. The next prime is 19989191. The reversal of 19989172 is 27198991.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10647 + ... + 12382.

Almost surely, 2^19989172 is an apocalyptic number.

It is an amenable number.

19989172 is an abundant number, since it is smaller than the sum of its proper divisors (21280588).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19989172 is a wasteful number, since it uses less digits than its factorization.

19989172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23071 (or 23069 counting only the distinct ones).

The product of its digits is 81648, while the sum is 46.

The square root of 19989172 is about 4470.9251838965. The cubic root of 19989172 is about 271.3927666265.

The spelling of 19989172 in words is "nineteen million, nine hundred eighty-nine thousand, one hundred seventy-two".