19889530 has 16 divisors (see below), whose sum is σ = 35886240. Its totient is φ = 7936912.

The previous prime is 19889509. The next prime is 19889537. The reversal of 19889530 is 3598891.

It is not an unprimeable number, because it can be changed into a prime (19889537) 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 7 ways as a sum of consecutive naturals, for example, 2541 + ... + 6799.

It is an arithmetic number, because the mean of its divisors is an integer number (2242890).

Almost surely, 2^19889530 is an apocalyptic number.

19889530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19889530 is a deficient number, since it is larger than the sum of its proper divisors (15996710).

19889530 is a wasteful number, since it uses less digits than its factorization.

19889530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4733.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 19889530 is about 4459.7679311821. The cubic root of 19889530 is about 270.9410691429.

The spelling of 19889530 in words is "nineteen million, eight hundred eighty-nine thousand, five hundred thirty".