6820539 has 16 divisors (see below), whose sum is σ = 10264320. Its totient is φ = 3990560.

The previous prime is 6820537. The next prime is 6820547. The reversal of 6820539 is 9350286.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 6820539 - 2¹ = 6820537 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (6820537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2607 + ... + 4520.

It is an arithmetic number, because the mean of its divisors is an integer number (641520).

Almost surely, 2^6820539 is an apocalyptic number.

6820539 is a deficient number, since it is larger than the sum of its proper divisors (3443781).

6820539 is a wasteful number, since it uses less digits than its factorization.

6820539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7170.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 6820539 is about 2611.6161662848. The cubic root of 6820539 is about 189.6442002472.

The spelling of 6820539 in words is "six million, eight hundred twenty thousand, five hundred thirty-nine".