243242005 has 8 divisors (see below), whose sum is σ = 292058424. Its totient is φ = 194481600.

The previous prime is 243241991. The next prime is 243242017. The reversal of 243242005 is 500242342.

It can be written as a sum of positive squares in 4 ways, for example, as 599076 + 242642929 = 774^2 + 15577^2 .

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

It is not a de Polignac number, because 243242005 - 2⁷ = 243241877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3766 + ... + 22375.

It is an arithmetic number, because the mean of its divisors is an integer number (36507303).

Almost surely, 2^243242005 is an apocalyptic number.

It is an amenable number.

243242005 is a deficient number, since it is larger than the sum of its proper divisors (48816419).

243242005 is a wasteful number, since it uses less digits than its factorization.

243242005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28007.

The product of its (nonzero) digits is 1920, while the sum is 22.

The square root of 243242005 is about 15596.2176504433. The cubic root of 243242005 is about 624.2322348449.

Adding to 243242005 its reverse (500242342), we get a palindrome (743484347).

The spelling of 243242005 in words is "two hundred forty-three million, two hundred forty-two thousand, five".