405406 has 8 divisors (see below), whose sum is σ = 618264. Its totient is φ = 199320.

The previous prime is 405401. The next prime is 405407. The reversal of 405406 is 604504.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405401) 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, 1540 + ... + 1783.

It is an arithmetic number, because the mean of its divisors is an integer number (77283).

2⁴⁰⁵⁴⁰⁶ is an apocalyptic number.

405406 is a deficient number, since it is larger than the sum of its proper divisors (212858).

405406 is a wasteful number, since it uses less digits than its factorization.

405406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3386.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 405406 is about 636.7150068908. The cubic root of 405406 is about 74.0110769880.

The spelling of 405406 in words is "four hundred five thousand, four hundred six".