19311802188 has 144 divisors (see below), whose sum is σ = 55599022080. Its totient is φ = 5183937024.

The previous prime is 19311802109. The next prime is 19311802189. The reversal of 19311802188 is 88120811391.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (19311802189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7185781 + ... + 7188467.

It is an arithmetic number, because the mean of its divisors is an integer number (386104320).

Almost surely, 2^19311802188 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19311802188, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27799511040).

19311802188 is an abundant number, since it is smaller than the sum of its proper divisors (36287219892).

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

19311802188 is a wasteful number, since it uses less digits than its factorization.

19311802188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3444 (or 3435 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 42.

The spelling of 19311802188 in words is "nineteen billion, three hundred eleven million, eight hundred two thousand, one hundred eighty-eight".