6539865 has 16 divisors (see below), whose sum is σ = 10549248. Its totient is φ = 3459456.

The previous prime is 6539839. The next prime is 6539867. The reversal of 6539865 is 5689356.

It is not a de Polignac number, because 6539865 - 2⁵ = 6539833 is a prime.

6539865 is a lucky number.

It is a plaindrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (6539867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 189 + ... + 3621.

It is an arithmetic number, because the mean of its divisors is an integer number (659328).

Almost surely, 2^6539865 is an apocalyptic number.

It is an amenable number.

6539865 is a deficient number, since it is larger than the sum of its proper divisors (4009383).

6539865 is a wasteful number, since it uses less digits than its factorization.

6539865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3568.

The product of its digits is 194400, while the sum is 42.

The square root of 6539865 is about 2557.3159757840. The cubic root of 6539865 is about 187.0063101381.

The spelling of 6539865 in words is "six million, five hundred thirty-nine thousand, eight hundred sixty-five".