6684539 has 4 divisors (see below), whose sum is σ = 6699624. Its totient is φ = 6669456.

The previous prime is 6684527. The next prime is 6684541. The reversal of 6684539 is 9354866.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9354866 = 2 ⋅4677433.

It is a cyclic number.

It is not a de Polignac number, because 6684539 - 2²⁰ = 5635963 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6684496 and 6684505.

It is not an unprimeable number, because it can be changed into a prime (6684569) 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, 6857 + ... + 7770.

It is an arithmetic number, because the mean of its divisors is an integer number (1674906).

Almost surely, 2^6684539 is an apocalyptic number.

6684539 is a deficient number, since it is larger than the sum of its proper divisors (15085).

6684539 is a wasteful number, since it uses less digits than its factorization.

6684539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15084.

The product of its digits is 155520, while the sum is 41.

The square root of 6684539 is about 2585.4475434632. The cubic root of 6684539 is about 188.3752408025.

The spelling of 6684539 in words is "six million, six hundred eighty-four thousand, five hundred thirty-nine".