6405406 has 16 divisors (see below), whose sum is σ = 11335680. Its totient is φ = 2656440.

The previous prime is 6405397. The next prime is 6405457. The reversal of 6405406 is 6045046.

It is a happy number.

It is an Ulam number.

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 7 ways as a sum of consecutive naturals, for example, 6946 + ... + 7813.

It is an arithmetic number, because the mean of its divisors is an integer number (708480).

Almost surely, 2^6405406 is an apocalyptic number.

6405406 is a deficient number, since it is larger than the sum of its proper divisors (4930274).

6405406 is a wasteful number, since it uses less digits than its factorization.

6405406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14799.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 6405406 is about 2530.8903571668. The cubic root of 6405406 is about 185.7158145267.

The spelling of 6405406 in words is "six million, four hundred five thousand, four hundred six".