19841878140 has 96 divisors (see below), whose sum is σ = 64845010944. Its totient is φ = 4438786560.

The previous prime is 19841878129. The next prime is 19841878141. The reversal of 19841878140 is 4187814891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19841878141) 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 31 ways as a sum of consecutive naturals, for example, 482841 + ... + 522320.

It is an arithmetic number, because the mean of its divisors is an integer number (675468864).

Almost surely, 2^19841878140 is an apocalyptic number.

19841878140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19841878140 is an abundant number, since it is smaller than the sum of its proper divisors (45003132804).

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

19841878140 is a wasteful number, since it uses less digits than its factorization.

19841878140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005227 (or 1005225 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 51.

The spelling of 19841878140 in words is "nineteen billion, eight hundred forty-one million, eight hundred seventy-eight thousand, one hundred forty".