405606 has 8 divisors (see below), whose sum is σ = 811224. Its totient is φ = 135200.

The previous prime is 405599. The next prime is 405607. The reversal of 405606 is 606504.

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

405606 is an admirable 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 3 ways as a sum of consecutive naturals, for example, 33795 + ... + 33806.

It is an arithmetic number, because the mean of its divisors is an integer number (101403).

2⁴⁰⁵⁶⁰⁶ is an apocalyptic number.

405606 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

405606 is a wasteful number, since it uses less digits than its factorization.

405606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67606.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 405606 is about 636.8720436634. The cubic root of 405606 is about 74.0232456798.

The spelling of 405606 in words is "four hundred five thousand, six hundred six".