19784338240 has 112 divisors (see below), whose sum is σ = 51301497600. Its totient is φ = 7238633472.

The previous prime is 19784338213. The next prime is 19784338241. The reversal of 19784338240 is 4283348791.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19784338241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120217 + ... + 232423.

Almost surely, 2^19784338240 is an apocalyptic number.

19784338240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19784338240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25650748800).

19784338240 is an abundant number, since it is smaller than the sum of its proper divisors (31517159360).

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

19784338240 is a wasteful number, since it uses less digits than its factorization.

19784338240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112272 (or 112262 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 49.

The spelling of 19784338240 in words is "nineteen billion, seven hundred eighty-four million, three hundred thirty-eight thousand, two hundred forty".