19985238 has 128 divisors (see below), whose sum is σ = 56448000. Its totient is φ = 5207328.

The previous prime is 19985227. The next prime is 19985243. The reversal of 19985238 is 83258991.

It is a happy number.

Its product of digits (155520) is a multiple of the sum of its prime divisors (108).

It is a junction number, because it is equal to n+sod(n) for n = 19985193 and 19985202.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 240745 + ... + 240827.

It is an arithmetic number, because the mean of its divisors is an integer number (441000).

Almost surely, 2^19985238 is an apocalyptic number.

19985238 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 19985238, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28224000).

19985238 is an abundant number, since it is smaller than the sum of its proper divisors (36462762).

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

19985238 is a wasteful number, since it uses less digits than its factorization.

19985238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128 (or 108 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 19985238 is about 4470.4852085652. The cubic root of 19985238 is about 271.3749615003.

The spelling of 19985238 in words is "nineteen million, nine hundred eighty-five thousand, two hundred thirty-eight".