6404906 has 4 divisors (see below), whose sum is σ = 9607362. Its totient is φ = 3202452.

The previous prime is 6404873. The next prime is 6404917. The reversal of 6404906 is 6094046.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 4879681 + 1525225 = 2209^2 + 1235^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1601225 + ... + 1601228.

Almost surely, 2^6404906 is an apocalyptic number.

6404906 is a deficient number, since it is larger than the sum of its proper divisors (3202456).

6404906 is a wasteful number, since it uses less digits than its factorization.

6404906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3202455.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 6404906 is about 2530.7915757723. The cubic root of 6404906 is about 185.7109821334.

The spelling of 6404906 in words is "six million, four hundred four thousand, nine hundred six".