6684391 has 16 divisors (see below), whose sum is σ = 7880704. Its totient is φ = 5552064.

The previous prime is 6684373. The next prime is 6684443. The reversal of 6684391 is 1934866.

It is not a de Polignac number, because 6684391 - 2¹³ = 6676199 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 6684391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6684341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52570 + ... + 52696.

It is an arithmetic number, because the mean of its divisors is an integer number (492544).

Almost surely, 2^6684391 is an apocalyptic number.

6684391 is a deficient number, since it is larger than the sum of its proper divisors (1196313).

6684391 is a wasteful number, since it uses less digits than its factorization.

6684391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310.

The product of its digits is 31104, while the sum is 37.

The square root of 6684391 is about 2585.4189215676. The cubic root of 6684391 is about 188.3738505425.

The spelling of 6684391 in words is "six million, six hundred eighty-four thousand, three hundred ninety-one".