243039 has 4 divisors (see below), whose sum is σ = 324056. Its totient is φ = 162024.

The previous prime is 243031. The next prime is 243073. The reversal of 243039 is 930342.

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

It is not a de Polignac number, because 243039 - 2³ = 243031 is a prime.

It is a d-powerful number, because it can be written as 2⁵ + 4⁸ + 0 + 3⁵ + 3¹¹ + 9² .

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40504 + ... + 40509.

It is an arithmetic number, because the mean of its divisors is an integer number (81014).

2²⁴³⁰³⁹ is an apocalyptic number.

243039 is a deficient number, since it is larger than the sum of its proper divisors (81017).

243039 is an equidigital number, since it uses as much as digits as its factorization.

243039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81016.

The product of its (nonzero) digits is 648, while the sum is 21.

The square root of 243039 is about 492.9898579078. The cubic root of 243039 is about 62.4058529191.

The spelling of 243039 in words is "two hundred forty-three thousand, thirty-nine".