6405806 has 8 divisors (see below), whose sum is σ = 10482264. Its totient is φ = 2911720.

The previous prime is 6405797. The next prime is 6405811. The reversal of 6405806 is 6085046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145565 + ... + 145608.

It is an arithmetic number, because the mean of its divisors is an integer number (1310283).

Almost surely, 2^6405806 is an apocalyptic number.

6405806 is a deficient number, since it is larger than the sum of its proper divisors (4076458).

6405806 is a wasteful number, since it uses less digits than its factorization.

6405806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291186.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 6405806 is about 2530.9693795066. The cubic root of 6405806 is about 185.7196802603.

Subtracting from 6405806 its product of nonzero digits (5760), we obtain a palindrome (6400046).

It can be divided in two parts, 640 and 5806, that added together give a palindrome (6446).

The spelling of 6405806 in words is "six million, four hundred five thousand, eight hundred six".