19884140 has 24 divisors (see below), whose sum is σ = 43197840. Its totient is φ = 7679168.

The previous prime is 19884079. The next prime is 19884143. The reversal of 19884140 is 4148891.

It is a self number, because there is not a number n which added to its sum of digits gives 19884140.

It is not an unprimeable number, because it can be changed into a prime (19884143) by changing a digit.

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, 16562 + ... + 17721.

It is an arithmetic number, because the mean of its divisors is an integer number (1799910).

Almost surely, 2^19884140 is an apocalyptic number.

19884140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19884140 is an abundant number, since it is smaller than the sum of its proper divisors (23313700).

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

19884140 is a wasteful number, since it uses less digits than its factorization.

19884140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34321 (or 34319 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 19884140 is about 4459.1635987032. The cubic root of 19884140 is about 270.9165922062.

The spelling of 19884140 in words is "nineteen million, eight hundred eighty-four thousand, one hundred forty".