243005 has 16 divisors (see below), whose sum is σ = 342144. Its totient is φ = 162240.

The previous prime is 242999. The next prime is 243011. The reversal of 243005 is 500342.

It is an interprime number because it is at equal distance from previous prime (242999) and next prime (243011).

It is not a de Polignac number, because 243005 - 2⁴ = 242989 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1790 + ... + 1920.

It is an arithmetic number, because the mean of its divisors is an integer number (21384).

2²⁴³⁰⁰⁵ is an apocalyptic number.

It is an amenable number.

243005 is a deficient number, since it is larger than the sum of its proper divisors (99139).

243005 is a wasteful number, since it uses less digits than its factorization.

243005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196.

The product of its (nonzero) digits is 120, while the sum is 14.

The square root of 243005 is about 492.9553732337. The cubic root of 243005 is about 62.4029426894.

Adding to 243005 its reverse (500342), we get a palindrome (743347).

The spelling of 243005 in words is "two hundred forty-three thousand, five".