405605 has 8 divisors (see below), whose sum is σ = 508032. Its totient is φ = 310288.

The previous prime is 405599. The next prime is 405607. The reversal of 405605 is 506504.

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 405605 - 2⁶ = 405541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405607) 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, 1649 + ... + 1878.

It is an arithmetic number, because the mean of its divisors is an integer number (63504).

2⁴⁰⁵⁶⁰⁵ is an apocalyptic number.

It is an amenable number.

405605 is a deficient number, since it is larger than the sum of its proper divisors (102427).

405605 is a wasteful number, since it uses less digits than its factorization.

405605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3555.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 405605 is about 636.8712585759. The cubic root of 405605 is about 74.0231848463.

It can be divided in two parts, 405 and 605, that multiplied together give a square (245025 = 495²).

The spelling of 405605 in words is "four hundred five thousand, six hundred five".