6505905 has 16 divisors (see below), whose sum is σ = 11896704. Its totient is φ = 2974080.

The previous prime is 6505867. The next prime is 6505931. The reversal of 6505905 is 5095056.

It is a happy number.

It is not a de Polignac number, because 6505905 - 2⁶ = 6505841 is a prime.

It is a Curzon number.

It is an unprimeable number.

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, 30876 + ... + 31085.

It is an arithmetic number, because the mean of its divisors is an integer number (743544).

Almost surely, 2^6505905 is an apocalyptic number.

It is an amenable number.

6505905 is a deficient number, since it is larger than the sum of its proper divisors (5390799).

6505905 is a wasteful number, since it uses less digits than its factorization.

6505905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61976.

The product of its (nonzero) digits is 6750, while the sum is 30.

The square root of 6505905 is about 2550.6675596792. The cubic root of 6505905 is about 186.6820547830.

It can be divided in two parts, 650 and 5905, that added together give a triangular number (6555 = T₁₁₄).

The spelling of 6505905 in words is "six million, five hundred five thousand, nine hundred five".