19884428 has 12 divisors (see below), whose sum is σ = 34943832. Its totient is φ = 9900480.

The previous prime is 19884419. The next prime is 19884433. The reversal of 19884428 is 82448891.

It is a happy 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 3 ways as a sum of consecutive naturals, for example, 9350 + ... + 11277.

It is an arithmetic number, because the mean of its divisors is an integer number (2911986).

Almost surely, 2^19884428 is an apocalyptic number.

It is an amenable number.

19884428 is a deficient number, since it is larger than the sum of its proper divisors (15059404).

19884428 is a wasteful number, since it uses less digits than its factorization.

19884428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20872 (or 20870 counting only the distinct ones).

The product of its digits is 147456, while the sum is 44.

The square root of 19884428 is about 4459.1958916379. The cubic root of 19884428 is about 270.9179001767.

The spelling of 19884428 in words is "nineteen million, eight hundred eighty-four thousand, four hundred twenty-eight".