243239929 has 4 divisors (see below), whose sum is σ = 243309220. Its totient is φ = 243170640.

The previous prime is 243239923. The next prime is 243239939. The reversal of 243239929 is 929932342.

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

It can be written as a sum of positive squares in 2 ways, for example, as 28676025 + 214563904 = 5355^2 + 14648^2 .

It is a cyclic number.

It is not a de Polignac number, because 243239929 - 2²¹ = 241142777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243239923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29082 + ... + 36499.

It is an arithmetic number, because the mean of its divisors is an integer number (60827305).

Almost surely, 2^243239929 is an apocalyptic number.

It is an amenable number.

243239929 is a deficient number, since it is larger than the sum of its proper divisors (69291).

243239929 is an equidigital number, since it uses as much as digits as its factorization.

243239929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69290.

The product of its digits is 209952, while the sum is 43.

The square root of 243239929 is about 15596.1510957031. The cubic root of 243239929 is about 624.2304589594.

The spelling of 243239929 in words is "two hundred forty-three million, two hundred thirty-nine thousand, nine hundred twenty-nine".