6404905 has 16 divisors (see below), whose sum is σ = 8334144. Its totient is φ = 4697280.

The previous prime is 6404873. The next prime is 6404917. The reversal of 6404905 is 5094046.

It is not a de Polignac number, because 6404905 - 2⁵ = 6404873 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13482 + ... + 13948.

It is an arithmetic number, because the mean of its divisors is an integer number (520884).

Almost surely, 2^6404905 is an apocalyptic number.

6404905 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

6404905 is a deficient number, since it is larger than the sum of its proper divisors (1929239).

6404905 is a wasteful number, since it uses less digits than its factorization.

6404905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 696.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 6404905 is about 2530.7913782056. The cubic root of 6404905 is about 185.7109724684.

The spelling of 6404905 in words is "six million, four hundred four thousand, nine hundred five".