19748685439 has 16 divisors (see below), whose sum is σ = 23528687616. Its totient is φ = 16219188000.

The previous prime is 19748685413. The next prime is 19748685449. The reversal of 19748685439 is 93458684791.

It is a cyclic number.

It is not a de Polignac number, because 19748685439 - 2¹⁹ = 19748161151 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19748685449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 428617 + ... + 472450.

It is an arithmetic number, because the mean of its divisors is an integer number (1470542976).

Almost surely, 2^19748685439 is an apocalyptic number.

19748685439 is a deficient number, since it is larger than the sum of its proper divisors (3780002177).

19748685439 is a wasteful number, since it uses less digits than its factorization.

19748685439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 901206.

The product of its digits is 52254720, while the sum is 64.

The spelling of 19748685439 in words is "nineteen billion, seven hundred forty-eight million, six hundred eighty-five thousand, four hundred thirty-nine".