405885 has 8 divisors (see below), whose sum is σ = 649440. Its totient is φ = 216464.

The previous prime is 405871. The next prime is 405893. The reversal of 405885 is 588504.

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 405885 - 2⁴ = 405869 is a prime.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 405885.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13515 + ... + 13544.

It is an arithmetic number, because the mean of its divisors is an integer number (81180).

2⁴⁰⁵⁸⁸⁵ is an apocalyptic number.

It is an amenable number.

405885 is a deficient number, since it is larger than the sum of its proper divisors (243555).

405885 is a wasteful number, since it uses less digits than its factorization.

405885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27067.

The product of its (nonzero) digits is 6400, while the sum is 30.

The square root of 405885 is about 637.0910452989. The cubic root of 405885 is about 74.0402143242.

The spelling of 405885 in words is "four hundred five thousand, eight hundred eighty-five".