204643 has 4 divisors (see below), whose sum is σ = 206568. Its totient is φ = 202720.

The previous prime is 204641. The next prime is 204667. The reversal of 204643 is 346402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 204643 - 2¹ = 204641 is a prime.

It is a d-powerful number, because it can be written as 2¹⁷ + 0 + 6⁵ + 4² + 4⁸ + 3⁵ .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 204643.

It is not an unprimeable number, because it can be changed into a prime (204641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 793 + ... + 1018.

It is an arithmetic number, because the mean of its divisors is an integer number (51642).

2²⁰⁴⁶⁴³ is an apocalyptic number.

204643 is a deficient number, since it is larger than the sum of its proper divisors (1925).

204643 is a wasteful number, since it uses less digits than its factorization.

204643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1924.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 204643 is about 452.3748445703. The cubic root of 204643 is about 58.9294378114.

It can be divided in two parts, 2046 and 43, that multiplied together give a palindrome (87978).

The spelling of 204643 in words is "two hundred four thousand, six hundred forty-three".