19394973689 has 16 divisors (see below), whose sum is σ = 24013694208. Its totient is φ = 15253572672.

The previous prime is 19394973569. The next prime is 19394973707. The reversal of 19394973689 is 98637949391.

It is not a de Polignac number, because 19394973689 - 2²⁴ = 19378196473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19394973089) 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, 622922 + ... + 653315.

It is an arithmetic number, because the mean of its divisors is an integer number (1500855888).

Almost surely, 2^19394973689 is an apocalyptic number.

It is an amenable number.

19394973689 is a deficient number, since it is larger than the sum of its proper divisors (4618720519).

19394973689 is a wasteful number, since it uses less digits than its factorization.

19394973689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1276424.

The product of its digits is 79361856, while the sum is 68.

The spelling of 19394973689 in words is "nineteen billion, three hundred ninety-four million, nine hundred seventy-three thousand, six hundred eighty-nine".