205443 has 16 divisors (see below), whose sum is σ = 348160. Its totient is φ = 117288.

The previous prime is 205441. The next prime is 205453. The reversal of 205443 is 344502.

It is a happy number.

It is not a de Polignac number, because 205443 - 2¹ = 205441 is a prime.

It is a Duffinian number.

205443 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 205443.

It is not an unprimeable number, because it can be changed into a prime (205441) 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 15 ways as a sum of consecutive naturals, for example, 355 + ... + 732.

It is an arithmetic number, because the mean of its divisors is an integer number (21760).

2²⁰⁵⁴⁴³ is an apocalyptic number.

205443 is a deficient number, since it is larger than the sum of its proper divisors (142717).

205443 is a wasteful number, since it uses less digits than its factorization.

205443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1103 (or 1097 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 205443 is about 453.2582045589. The cubic root of 205443 is about 59.0061278707.

Adding to 205443 its reverse (344502), we get a palindrome (549945).

The spelling of 205443 in words is "two hundred five thousand, four hundred forty-three".