19803381842 has 8 divisors (see below), whose sum is σ = 30265545996. Its totient is φ = 9714866512.

The previous prime is 19803381827. The next prime is 19803381887. The reversal of 19803381842 is 24818330891.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19589081521 + 214300321 = 139961^2 + 14639^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93412073 + ... + 93412284.

Almost surely, 2^19803381842 is an apocalyptic number.

19803381842 is a deficient number, since it is larger than the sum of its proper divisors (10462164154).

19803381842 is a wasteful number, since it uses less digits than its factorization.

19803381842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186824412.

The product of its (nonzero) digits is 331776, while the sum is 47.

The spelling of 19803381842 in words is "nineteen billion, eight hundred three million, three hundred eighty-one thousand, eight hundred forty-two".