19404049689 has 30 divisors (see below), whose sum is σ = 29135794974. Its totient is φ = 12869435520.

The previous prime is 19404049681. The next prime is 19404049771. The reversal of 19404049689 is 98694040491.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 12428459289 + 6975590400 = 111483^2 + 83520^2 .

It is not a de Polignac number, because 19404049689 - 2³ = 19404049681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19404049681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 19461939 + ... + 19462935.

Almost surely, 2^19404049689 is an apocalyptic number.

It is an amenable number.

19404049689 is a deficient number, since it is larger than the sum of its proper divisors (9731745285).

19404049689 is an frugal number, since it uses more digits than its factorization.

19404049689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2247 (or 1241 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 54.

The spelling of 19404049689 in words is "nineteen billion, four hundred four million, forty-nine thousand, six hundred eighty-nine".