19872443789 has 8 divisors (see below), whose sum is σ = 21707676768. Its totient is φ = 18041985360.

The previous prime is 19872443737. The next prime is 19872443797. The reversal of 19872443789 is 98734427891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19872443789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19872443089) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1184927 + ... + 1201580.

It is an arithmetic number, because the mean of its divisors is an integer number (2713459596).

Almost surely, 2^19872443789 is an apocalyptic number.

It is an amenable number.

19872443789 is a deficient number, since it is larger than the sum of its proper divisors (1835232979).

19872443789 is a wasteful number, since it uses less digits than its factorization.

19872443789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2387275.

The product of its digits is 24385536, while the sum is 62.

The spelling of 19872443789 in words is "nineteen billion, eight hundred seventy-two million, four hundred forty-three thousand, seven hundred eighty-nine".