6405478 has 16 divisors (see below), whose sum is σ = 9884160. Its totient is φ = 3112200.

The previous prime is 6405473. The next prime is 6405493. The reversal of 6405478 is 8745046.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6405473) by changing a digit.

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, 10933 + ... + 11503.

It is an arithmetic number, because the mean of its divisors is an integer number (617760).

Almost surely, 2^6405478 is an apocalyptic number.

6405478 is a deficient number, since it is larger than the sum of its proper divisors (3478682).

6405478 is a wasteful number, since it uses less digits than its factorization.

6405478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723.

The product of its (nonzero) digits is 26880, while the sum is 34.

The square root of 6405478 is about 2530.9045813701. The cubic root of 6405478 is about 185.7165103706.

The spelling of 6405478 in words is "six million, four hundred five thousand, four hundred seventy-eight".