19389926808 has 288 divisors, whose sum is σ = 64534579200. Its totient is φ = 5233447296.

The previous prime is 19389926789. The next prime is 19389926819. The reversal of 19389926808 is 80862998391.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

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 71 ways as a sum of consecutive naturals, for example, 6733513 + ... + 6736391.

It is an arithmetic number, because the mean of its divisors is an integer number (224078400).

Almost surely, 2^19389926808 is an apocalyptic number.

19389926808 is a gapful number since it is divisible by the number (18) 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 19389926808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32267289600).

19389926808 is an abundant number, since it is smaller than the sum of its proper divisors (45144652392).

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

19389926808 is a wasteful number, since it uses less digits than its factorization.

19389926808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3011 (or 2997 counting only the distinct ones).

The product of its (nonzero) digits is 13436928, while the sum is 63.

The spelling of 19389926808 in words is "nineteen billion, three hundred eighty-nine million, nine hundred twenty-six thousand, eight hundred eight".