206404065 has 32 divisors (see below), whose sum is σ = 419362560. Its totient is φ = 94355712.

The previous prime is 206404061. The next prime is 206404073. The reversal of 206404065 is 560404602.

It is a happy number.

It is not a de Polignac number, because 206404065 - 2² = 206404061 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (206404061) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 108264 + ... + 110153.

It is an arithmetic number, because the mean of its divisors is an integer number (13105080).

Almost surely, 2^206404065 is an apocalyptic number.

It is an amenable number.

206404065 is an abundant number, since it is smaller than the sum of its proper divisors (212958495).

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

206404065 is a wasteful number, since it uses less digits than its factorization.

206404065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218438 (or 218432 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 206404065 is about 14366.7694698565. The cubic root of 206404065 is about 590.9799524236.

Adding to 206404065 its reverse (560404602), we get a palindrome (766808667).

The spelling of 206404065 in words is "two hundred six million, four hundred four thousand, sixty-five".