6939021389 has 8 divisors (see below), whose sum is σ = 7054940568. Its totient is φ = 6823172160.

The previous prime is 6939021347. The next prime is 6939021433. The reversal of 6939021389 is 9831209396.

It can be written as a sum of positive squares in 4 ways, for example, as 220760164 + 6718261225 = 14858^2 + 81965^2 .

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 6939021389 - 2²⁰ = 6937972813 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6939021319) 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, 206219 + ... + 237495.

It is an arithmetic number, because the mean of its divisors is an integer number (881867571).

Almost surely, 2^6939021389 is an apocalyptic number.

It is an amenable number.

6939021389 is a deficient number, since it is larger than the sum of its proper divisors (115919179).

6939021389 is a wasteful number, since it uses less digits than its factorization.

6939021389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34975.

The product of its (nonzero) digits is 629856, while the sum is 50.

The square root of 6939021389 is about 83300.7886457265. The cubic root of 6939021389 is about 1907.3603136861.

The spelling of 6939021389 in words is "six billion, nine hundred thirty-nine million, twenty-one thousand, three hundred eighty-nine".