206406 has 12 divisors (see below), whose sum is σ = 447252. Its totient is φ = 68796.

The previous prime is 206399. The next prime is 206407. The reversal of 206406 is 604602.

206406 is a `hidden beast` number, since 20 + 640 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 11467 = 206406 / (2 + 0 + 6 + 4 + 0 + 6).

It is an Ulam number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 206406.

It is not an unprimeable number, because it can be changed into a prime (206407) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5716 + ... + 5751.

It is an arithmetic number, because the mean of its divisors is an integer number (37271).

2²⁰⁶⁴⁰⁶ is an apocalyptic number.

206406 is an abundant number, since it is smaller than the sum of its proper divisors (240846).

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

206406 is a wasteful number, since it uses less digits than its factorization.

206406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11475 (or 11472 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 206406 is about 454.3192709978. The cubic root of 206406 is about 59.0981799194.

The spelling of 206406 in words is "two hundred six thousand, four hundred six".