6853440439 has 4 divisors (see below), whose sum is σ = 6853908280. Its totient is φ = 6852972600.

The previous prime is 6853440421. The next prime is 6853440443. The reversal of 6853440439 is 9340443586.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6853440439 - 2¹¹ = 6853438391 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 (6853140439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211212 + ... + 241489.

It is an arithmetic number, because the mean of its divisors is an integer number (1713477070).

Almost surely, 2^6853440439 is an apocalyptic number.

6853440439 is a deficient number, since it is larger than the sum of its proper divisors (467841).

6853440439 is a wasteful number, since it uses less digits than its factorization.

6853440439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467840.

The product of its (nonzero) digits is 1244160, while the sum is 46.

The square root of 6853440439 is about 82785.5086292281. The cubic root of 6853440439 is about 1899.4865130400.

The spelling of 6853440439 in words is "six billion, eight hundred fifty-three million, four hundred forty thousand, four hundred thirty-nine".