19985172 has 24 divisors (see below), whose sum is σ = 46872000. Its totient is φ = 6627456.

The previous prime is 19985123. The next prime is 19985179. The reversal of 19985172 is 27158991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19985179) 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 in 7 ways as a sum of consecutive naturals, for example, 1797 + ... + 6572.

It is an arithmetic number, because the mean of its divisors is an integer number (1953000).

Almost surely, 2^19985172 is an apocalyptic number.

19985172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19985172 is an abundant number, since it is smaller than the sum of its proper divisors (26886828).

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

19985172 is a wasteful number, since it uses less digits than its factorization.

19985172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8575 (or 8573 counting only the distinct ones).

The product of its digits is 45360, while the sum is 42.

The square root of 19985172 is about 4470.4778268100. The cubic root of 19985172 is about 271.3746627670.

The spelling of 19985172 in words is "nineteen million, nine hundred eighty-five thousand, one hundred seventy-two".