6540686 has 4 divisors (see below), whose sum is σ = 9811032. Its totient is φ = 3270342.

The previous prime is 6540679. The next prime is 6540691. The reversal of 6540686 is 6860456.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1635170 + ... + 1635173.

It is an arithmetic number, because the mean of its divisors is an integer number (2452758).

Almost surely, 2^6540686 is an apocalyptic number.

6540686 is a deficient number, since it is larger than the sum of its proper divisors (3270346).

6540686 is a wasteful number, since it uses less digits than its factorization.

6540686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3270345.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 6540686 is about 2557.4764906055. The cubic root of 6540686 is about 187.0141352618.

The spelling of 6540686 in words is "six million, five hundred forty thousand, six hundred eighty-six".