19744616394 has 12 divisors (see below), whose sum is σ = 42780002226. Its totient is φ = 6581538792.

The previous prime is 19744616393. The next prime is 19744616401. The reversal of 19744616394 is 49361644791.

19744616394 is a `hidden beast` number, since 1 + 97 + 4 + 461 + 6 + 3 + 94 = 666.

It can be written as a sum of positive squares in only one way, i.e., 11451782169 + 8292834225 = 107013^2 + 91065^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 19744616394.

It is not an unprimeable number, because it can be changed into a prime (19744616393) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 548461549 + ... + 548461584.

Almost surely, 2^19744616394 is an apocalyptic number.

19744616394 is an abundant number, since it is smaller than the sum of its proper divisors (23035385832).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19744616394 is a wasteful number, since it uses less digits than its factorization.

19744616394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1096923141 (or 1096923138 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 54.

The spelling of 19744616394 in words is "nineteen billion, seven hundred forty-four million, six hundred sixteen thousand, three hundred ninety-four".