19749392742 has 32 divisors (see below), whose sum is σ = 40098945024. Its totient is φ = 6483788000.

The previous prime is 19749392717. The next prime is 19749392759. The reversal of 19749392742 is 24729394791.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30433 + ... + 201059.

It is an arithmetic number, because the mean of its divisors is an integer number (1253092032).

Almost surely, 2^19749392742 is an apocalyptic number.

19749392742 is an abundant number, since it is smaller than the sum of its proper divisors (20349552282).

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

19749392742 is a wasteful number, since it uses less digits than its factorization.

19749392742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170924.

The product of its digits is 6858432, while the sum is 57.

The spelling of 19749392742 in words is "nineteen billion, seven hundred forty-nine million, three hundred ninety-two thousand, seven hundred forty-two".