19399887933 has 4 divisors (see below), whose sum is σ = 25866517248. Its totient is φ = 12933258620.

The previous prime is 19399887919. The next prime is 19399887979. The reversal of 19399887933 is 33978899391.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19399887933 - 2¹² = 19399883837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19399887833) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3233314653 + ... + 3233314658.

It is an arithmetic number, because the mean of its divisors is an integer number (6466629312).

Almost surely, 2^19399887933 is an apocalyptic number.

It is an amenable number.

19399887933 is a deficient number, since it is larger than the sum of its proper divisors (6466629315).

19399887933 is an equidigital number, since it uses as much as digits as its factorization.

19399887933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6466629314.

The product of its digits is 79361856, while the sum is 69.

The spelling of 19399887933 in words is "nineteen billion, three hundred ninety-nine million, eight hundred eighty-seven thousand, nine hundred thirty-three".