19449787393 has 4 divisors (see below), whose sum is σ = 19668324420. Its totient is φ = 19231250368.

The previous prime is 19449787333. The next prime is 19449787417. The reversal of 19449787393 is 39378794491.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9589893184 + 9859894209 = 97928^2 + 99297^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19449787393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19449787333) 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, 109268380 + ... + 109268557.

It is an arithmetic number, because the mean of its divisors is an integer number (4917081105).

Almost surely, 2^19449787393 is an apocalyptic number.

It is an amenable number.

19449787393 is a deficient number, since it is larger than the sum of its proper divisors (218537027).

19449787393 is an equidigital number, since it uses as much as digits as its factorization.

19449787393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218537026.

The product of its digits is 41150592, while the sum is 64.

The spelling of 19449787393 in words is "nineteen billion, four hundred forty-nine million, seven hundred eighty-seven thousand, three hundred ninety-three".