205473 has 4 divisors (see below), whose sum is σ = 273968. Its totient is φ = 136980.

The previous prime is 205463. The next prime is 205477. The reversal of 205473 is 374502.

It is a happy number.

205473 is nontrivially palindromic in base 12.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 205473 - 2⁵ = 205441 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205477) 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, 34243 + ... + 34248.

It is an arithmetic number, because the mean of its divisors is an integer number (68492).

2²⁰⁵⁴⁷³ is an apocalyptic number.

It is an amenable number.

205473 is a deficient number, since it is larger than the sum of its proper divisors (68495).

205473 is an equidigital number, since it uses as much as digits as its factorization.

205473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68494.

The product of its (nonzero) digits is 840, while the sum is 21.

The square root of 205473 is about 453.2912970707. The cubic root of 205473 is about 59.0089998719.

Adding to 205473 its reverse (374502), we get a palindrome (579975).

The spelling of 205473 in words is "two hundred five thousand, four hundred seventy-three".