17978842839 has 8 divisors (see below), whose sum is σ = 23977143792. Its totient is φ = 11983218560.

The previous prime is 17978842811. The next prime is 17978842897. The reversal of 17978842839 is 93824887971.

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

It is a cyclic number.

It is not a de Polignac number, because 17978842839 - 2¹¹ = 17978840791 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 17978842839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17978844839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 653442 + ... + 680399.

It is an arithmetic number, because the mean of its divisors is an integer number (2997142974).

Almost surely, 2^17978842839 is an apocalyptic number.

17978842839 is a deficient number, since it is larger than the sum of its proper divisors (5998300953).

17978842839 is a wasteful number, since it uses less digits than its factorization.

17978842839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1338337.

The product of its digits is 48771072, while the sum is 66.

The spelling of 17978842839 in words is "seventeen billion, nine hundred seventy-eight million, eight hundred forty-two thousand, eight hundred thirty-nine".