19888989 has 16 divisors (see below), whose sum is σ = 27123264. Its totient is φ = 12960000.

The previous prime is 19888969. The next prime is 19889027. The reversal of 19888989 is 98988891.

It is a de Polignac number, because none of the positive numbers 2^k-19888989 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19888909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45717 + ... + 46149.

It is an arithmetic number, because the mean of its divisors is an integer number (1695204).

Almost surely, 2^19888989 is an apocalyptic number.

It is an amenable number.

19888989 is a deficient number, since it is larger than the sum of its proper divisors (7234275).

19888989 is a wasteful number, since it uses less digits than its factorization.

19888989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748.

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

The square root of 19888989 is about 4459.7072773894. The cubic root of 19888989 is about 270.9386125666.

The spelling of 19888989 in words is "nineteen million, eight hundred eighty-eight thousand, nine hundred eighty-nine".