6405405 has 16 divisors (see below), whose sum is σ = 10342080. Its totient is φ = 3385088.

The previous prime is 6405397. The next prime is 6405457. The reversal of 6405405 is 5045046.

It is a cyclic number.

It is not a de Polignac number, because 6405405 - 2³ = 6405397 is a prime.

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 in 15 ways as a sum of consecutive naturals, for example, 195 + ... + 3584.

It is an arithmetic number, because the mean of its divisors is an integer number (646380).

Almost surely, 2^6405405 is an apocalyptic number.

It is an amenable number.

6405405 is a deficient number, since it is larger than the sum of its proper divisors (3936675).

6405405 is a wasteful number, since it uses less digits than its factorization.

6405405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3900.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 6405405 is about 2530.8901596079. The cubic root of 6405405 is about 185.7158048622.

The spelling of 6405405 in words is "six million, four hundred five thousand, four hundred five".