205406 has 8 divisors (see below), whose sum is σ = 318144. Its totient is φ = 99360.

The previous prime is 205399. The next prime is 205417. The reversal of 205406 is 604502.

205406 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1595 + ... + 1718.

It is an arithmetic number, because the mean of its divisors is an integer number (39768).

2²⁰⁵⁴⁰⁶ is an apocalyptic number.

205406 is a deficient number, since it is larger than the sum of its proper divisors (112738).

205406 is a wasteful number, since it uses less digits than its factorization.

205406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3346.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 205406 is about 453.2173871334. The cubic root of 205406 is about 59.0025853507.

Adding to 205406 its reverse (604502), we get a palindrome (809908).

The spelling of 205406 in words is "two hundred five thousand, four hundred six".