406605 has 8 divisors (see below), whose sum is σ = 650592. Its totient is φ = 216848.

The previous prime is 406591. The next prime is 406631. The reversal of 406605 is 506604.

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 406605 - 2⁵ = 406573 is a prime.

It is a congruent 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, 13539 + ... + 13568.

It is an arithmetic number, because the mean of its divisors is an integer number (81324).

2⁴⁰⁶⁶⁰⁵ is an apocalyptic number.

It is an amenable number.

406605 is a deficient number, since it is larger than the sum of its proper divisors (243987).

406605 is a wasteful number, since it uses less digits than its factorization.

406605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27115.

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

The square root of 406605 is about 637.6558632993. The cubic root of 406605 is about 74.0839684777.

Subtracting 406605 from its reverse (506604), we obtain a palindrome (99999).

The spelling of 406605 in words is "four hundred six thousand, six hundred five".