19381804394 has 8 divisors (see below), whose sum is σ = 29096365860. Its totient is φ = 9683015776.

The previous prime is 19381804333. The next prime is 19381804441. The reversal of 19381804394 is 49340818391.

It can be written as a sum of positive squares in 2 ways, for example, as 16883104225 + 2498700169 = 129935^2 + 49987^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3940139 + ... + 3945054.

Almost surely, 2^19381804394 is an apocalyptic number.

19381804394 is a deficient number, since it is larger than the sum of its proper divisors (9714561466).

19381804394 is a wasteful number, since it uses less digits than its factorization.

19381804394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7886424.

The product of its (nonzero) digits is 746496, while the sum is 50.

The spelling of 19381804394 in words is "nineteen billion, three hundred eighty-one million, eight hundred four thousand, three hundred ninety-four".