6539843 has 4 divisors (see below), whose sum is σ = 6824208. Its totient is φ = 6255480.

The previous prime is 6539839. The next prime is 6539867. The reversal of 6539843 is 3489356.

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 6539843 - 2² = 6539839 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6539797 and 6539806.

It is not an unprimeable number, because it can be changed into a prime (6539833) 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 3 ways as a sum of consecutive naturals, for example, 142148 + ... + 142193.

It is an arithmetic number, because the mean of its divisors is an integer number (1706052).

Almost surely, 2^6539843 is an apocalyptic number.

6539843 is a deficient number, since it is larger than the sum of its proper divisors (284365).

6539843 is a wasteful number, since it uses less digits than its factorization.

6539843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284364.

The product of its digits is 77760, while the sum is 38.

The square root of 6539843 is about 2557.3116743956. The cubic root of 6539843 is about 187.0061004425.

The spelling of 6539843 in words is "six million, five hundred thirty-nine thousand, eight hundred forty-three".