6939021397 has 16 divisors (see below), whose sum is σ = 8727818112. Its totient is φ = 5359173120.

The previous prime is 6939021347. The next prime is 6939021433. The reversal of 6939021397 is 7931209396.

It is not a de Polignac number, because 6939021397 - 2¹⁵ = 6938988629 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6939021397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6939021347) 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, 390048 + ... + 407449.

It is an arithmetic number, because the mean of its divisors is an integer number (545488632).

Almost surely, 2^6939021397 is an apocalyptic number.

It is an amenable number.

6939021397 is a deficient number, since it is larger than the sum of its proper divisors (1788796715).

6939021397 is a wasteful number, since it uses less digits than its factorization.

6939021397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797628.

The product of its (nonzero) digits is 551124, while the sum is 49.

The square root of 6939021397 is about 83300.7886937453. The cubic root of 6939021397 is about 1907.3603144191.

The spelling of 6939021397 in words is "six billion, nine hundred thirty-nine million, twenty-one thousand, three hundred ninety-seven".