6400404 has 24 divisors (see below), whose sum is σ = 16593920. Its totient is φ = 2133432.

The previous prime is 6400403. The next prime is 6400411. The reversal of 6400404 is 4040046.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6400403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29524 + ... + 29739.

Almost surely, 2^6400404 is an apocalyptic number.

It is an amenable number.

6400404 is an abundant number, since it is smaller than the sum of its proper divisors (10193516).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6400404 is a wasteful number, since it uses less digits than its factorization.

6400404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59276 (or 59268 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 6400404 is about 2529.9019743856. The cubic root of 6400404 is about 185.6674599329.

The spelling of 6400404 in words is "six million, four hundred thousand, four hundred four".