6542865 has 24 divisors (see below), whose sum is σ = 12961728. Its totient is φ = 2990880.

The previous prime is 6542857. The next prime is 6542867. The reversal of 6542865 is 5682456.

It is not a de Polignac number, because 6542865 - 2³ = 6542857 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (6542867) 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 23 ways as a sum of consecutive naturals, for example, 10071 + ... + 10700.

It is an arithmetic number, because the mean of its divisors is an integer number (540072).

Almost surely, 2^6542865 is an apocalyptic number.

It is an amenable number.

6542865 is a deficient number, since it is larger than the sum of its proper divisors (6418863).

6542865 is a wasteful number, since it uses less digits than its factorization.

6542865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20789 (or 20786 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 6542865 is about 2557.9024610020. The cubic root of 6542865 is about 187.0349005942.

The spelling of 6542865 in words is "six million, five hundred forty-two thousand, eight hundred sixty-five".