19393945208 has 64 divisors (see below), whose sum is σ = 40373532000. Its totient is φ = 8659353600.

The previous prime is 19393945201. The next prime is 19393945211. The reversal of 19393945208 is 80254939391.

It is a super-2 number, since 2×19393945208² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19393945208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19393945201) 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 15 ways as a sum of consecutive naturals, for example, 4984928 + ... + 4988816.

Almost surely, 2^19393945208 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 19393945208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20186766000).

19393945208 is an abundant number, since it is smaller than the sum of its proper divisors (20979586792).

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

19393945208 is a wasteful number, since it uses less digits than its factorization.

19393945208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4896 (or 4892 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 53.

The spelling of 19393945208 in words is "nineteen billion, three hundred ninety-three million, nine hundred forty-five thousand, two hundred eight".