243506 has 8 divisors (see below), whose sum is σ = 368940. Its totient is φ = 120528.

The previous prime is 243487. The next prime is 243517. The reversal of 243506 is 605342.

It can be written as a sum of positive squares in 2 ways, for example, as 235225 + 8281 = 485^2 + 91^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

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, 341 + ... + 776.

2²⁴³⁵⁰⁶ is an apocalyptic number.

243506 is a deficient number, since it is larger than the sum of its proper divisors (125434).

243506 is a wasteful number, since it uses less digits than its factorization.

243506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1228.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 243506 is about 493.4632711763. The cubic root of 243506 is about 62.4457983418.

Adding to 243506 its reverse (605342), we get a palindrome (848848).

The spelling of 243506 in words is "two hundred forty-three thousand, five hundred six".