19391847393 has 16 divisors (see below), whose sum is σ = 27223661120. Its totient is φ = 12244317696.

The previous prime is 19391847379. The next prime is 19391847403. The reversal of 19391847393 is 39374819391.

It is a de Polignac number, because none of the positive numbers 2^k-19391847393 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19391847493) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 189321 + ... + 273177.

It is an arithmetic number, because the mean of its divisors is an integer number (1701478820).

Almost surely, 2^19391847393 is an apocalyptic number.

It is an amenable number.

19391847393 is a deficient number, since it is larger than the sum of its proper divisors (7831813727).

19391847393 is a wasteful number, since it uses less digits than its factorization.

19391847393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87936.

The product of its digits is 4408992, while the sum is 57.

The spelling of 19391847393 in words is "nineteen billion, three hundred ninety-one million, eight hundred forty-seven thousand, three hundred ninety-three".