243904339 has 4 divisors (see below), whose sum is σ = 278747824. Its totient is φ = 209060856.

The previous prime is 243904337. The next prime is 243904361. The reversal of 243904339 is 933409342.

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

It is a cyclic number.

It is not a de Polignac number, because 243904339 - 2¹ = 243904337 is a prime.

It is a super-3 number, since 3×243904339³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243904298 and 243904307.

It is not an unprimeable number, because it can be changed into a prime (243904337) 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, 17421732 + ... + 17421745.

It is an arithmetic number, because the mean of its divisors is an integer number (69686956).

Almost surely, 2^243904339 is an apocalyptic number.

243904339 is a deficient number, since it is larger than the sum of its proper divisors (34843485).

243904339 is an equidigital number, since it uses as much as digits as its factorization.

243904339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34843484.

The product of its (nonzero) digits is 69984, while the sum is 37.

The square root of 243904339 is about 15617.4370176415. The cubic root of 243904339 is about 624.7983041971.

The spelling of 243904339 in words is "two hundred forty-three million, nine hundred four thousand, three hundred thirty-nine".