19391493933 has 32 divisors (see below), whose sum is σ = 33122745600. Its totient is φ = 10982780928.

The previous prime is 19391493929. The next prime is 19391493941. The reversal of 19391493933 is 33939419391.

It is not a de Polignac number, because 19391493933 - 2² = 19391493929 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19391493933.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19391494933) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 432628 + ... + 475341.

It is an arithmetic number, because the mean of its divisors is an integer number (1035085800).

Almost surely, 2^19391493933 is an apocalyptic number.

It is an amenable number.

19391493933 is a deficient number, since it is larger than the sum of its proper divisors (13731251667).

19391493933 is a wasteful number, since it uses less digits than its factorization.

19391493933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 908098 (or 908092 counting only the distinct ones).

The product of its digits is 2125764, while the sum is 54.

The spelling of 19391493933 in words is "nineteen billion, three hundred ninety-one million, four hundred ninety-three thousand, nine hundred thirty-three".