404905 has 8 divisors (see below), whose sum is σ = 496512. Its totient is φ = 316848.

The previous prime is 404851. The next prime is 404941. The reversal of 404905 is 509404.

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

It is a cyclic number.

It is not a de Polignac number, because 404905 - 2¹³ = 396713 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 627 + ... + 1096.

It is an arithmetic number, because the mean of its divisors is an integer number (62064).

2⁴⁰⁴⁹⁰⁵ is an apocalyptic number.

It is an amenable number.

404905 is a deficient number, since it is larger than the sum of its proper divisors (91607).

404905 is a wasteful number, since it uses less digits than its factorization.

404905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1775.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 404905 is about 636.3214596413. The cubic root of 404905 is about 73.9805768356.

The spelling of 404905 in words is "four hundred four thousand, nine hundred five".