243989339 has 8 divisors (see below), whose sum is σ = 267710832. Its totient is φ = 220524640.

The previous prime is 243989329. The next prime is 243989363. The reversal of 243989339 is 933989342.

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

It is a cyclic number.

It is not a de Polignac number, because 243989339 - 2¹² = 243985243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243989309) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62204 + ... + 66009.

It is an arithmetic number, because the mean of its divisors is an integer number (33463854).

Almost surely, 2^243989339 is an apocalyptic number.

243989339 is a deficient number, since it is larger than the sum of its proper divisors (23721493).

243989339 is a wasteful number, since it uses less digits than its factorization.

243989339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128397.

The product of its digits is 1259712, while the sum is 50.

The square root of 243989339 is about 15620.1580977915. The cubic root of 243989339 is about 624.8708759383.

The spelling of 243989339 in words is "two hundred forty-three million, nine hundred eighty-nine thousand, three hundred thirty-nine".