19884138 has 16 divisors (see below), whose sum is σ = 39820896. Its totient is φ = 6619280.

The previous prime is 19884079. The next prime is 19884143. The reversal of 19884138 is 83148891.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 19884138.

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 7 ways as a sum of consecutive naturals, for example, 4120 + ... + 7532.

It is an arithmetic number, because the mean of its divisors is an integer number (2488806).

Almost surely, 2^19884138 is an apocalyptic number.

19884138 is an abundant number, since it is smaller than the sum of its proper divisors (19936758).

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

19884138 is a wasteful number, since it uses less digits than its factorization.

19884138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4389.

The product of its digits is 55296, while the sum is 42.

The square root of 19884138 is about 4459.1633744459. The cubic root of 19884138 is about 270.9165831231.

The spelling of 19884138 in words is "nineteen million, eight hundred eighty-four thousand, one hundred thirty-eight".