6729391 has 4 divisors (see below), whose sum is σ = 6810552. Its totient is φ = 6648232.

The previous prime is 6729389. The next prime is 6729419. The reversal of 6729391 is 1939276.

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 6729391 - 2¹ = 6729389 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 6729391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6729341) 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, 40456 + ... + 40621.

It is an arithmetic number, because the mean of its divisors is an integer number (1702638).

Almost surely, 2^6729391 is an apocalyptic number.

6729391 is a deficient number, since it is larger than the sum of its proper divisors (81161).

6729391 is an equidigital number, since it uses as much as digits as its factorization.

6729391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81160.

The product of its digits is 20412, while the sum is 37.

The square root of 6729391 is about 2594.1069754349. The cubic root of 6729391 is about 188.7956227889.

The spelling of 6729391 in words is "six million, seven hundred twenty-nine thousand, three hundred ninety-one".