19989888 has 32 divisors (see below), whose sum is σ = 53099160. Its totient is φ = 6663168.

The previous prime is 19989887. The next prime is 19989911. The reversal of 19989888 is 88898991.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19989887) by changing a digit.

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, 25645 + ... + 26412.

Almost surely, 2^19989888 is an apocalyptic number.

It is an amenable number.

19989888 is an abundant number, since it is smaller than the sum of its proper divisors (33109272).

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

19989888 is an equidigital number, since it uses as much as digits as its factorization.

19989888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52074 (or 52062 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 60.

The square root of 19989888 is about 4471.0052560917. The cubic root of 19989888 is about 271.3960069625.

The spelling of 19989888 in words is "nineteen million, nine hundred eighty-nine thousand, eight hundred eighty-eight".