206404 has 12 divisors (see below), whose sum is σ = 394128. Its totient is φ = 93800.

The previous prime is 206399. The next prime is 206407. The reversal of 206404 is 404602.

206404 is nontrivially palindromic in base 6.

It is a super-2 number, since 2×206404² = 85205222432, which contains 22 as substring.

It is an Ulam number.

It is a pancake number, because a pancake can be divided into 206404 parts by 642 straight cuts.

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

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2302 + ... + 2389.

It is an arithmetic number, because the mean of its divisors is an integer number (32844).

2²⁰⁶⁴⁰⁴ is an apocalyptic number.

It is an amenable number.

206404 is a deficient number, since it is larger than the sum of its proper divisors (187724).

206404 is a wasteful number, since it uses less digits than its factorization.

206404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4706 (or 4704 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 206404 is about 454.3170698972. The cubic root of 206404 is about 59.0979890387.

The spelling of 206404 in words is "two hundred six thousand, four hundred four".