17989421839 has 16 divisors (see below), whose sum is σ = 18790128000. Its totient is φ = 17201368800.

The previous prime is 17989421837. The next prime is 17989421881. The reversal of 17989421839 is 93812498971.

It is a cyclic number.

It is not a de Polignac number, because 17989421839 - 2¹ = 17989421837 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 (17989421831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1683664 + ... + 1694314.

It is an arithmetic number, because the mean of its divisors is an integer number (1174383000).

Almost surely, 2^17989421839 is an apocalyptic number.

17989421839 is a deficient number, since it is larger than the sum of its proper divisors (800706161).

17989421839 is a wasteful number, since it uses less digits than its factorization.

17989421839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11238.

The product of its digits is 7838208, while the sum is 61.

The spelling of 17989421839 in words is "seventeen billion, nine hundred eighty-nine million, four hundred twenty-one thousand, eight hundred thirty-nine".