243440039 has 2 divisors, whose sum is σ = 243440040. Its totient is φ = 243440038.

The previous prime is 243440033. The next prime is 243440047. The reversal of 243440039 is 930044342.

243440039 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243440039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 243439993 and 243440020.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243440033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121720019 + 121720020.

It is an arithmetic number, because the mean of its divisors is an integer number (121720020).

Almost surely, 2^243440039 is an apocalyptic number.

243440039 is a deficient number, since it is larger than the sum of its proper divisors (1).

243440039 is an equidigital number, since it uses as much as digits as its factorization.

243440039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 243440039 is about 15602.5651416682. The cubic root of 243440039 is about 624.4015938523.

The spelling of 243440039 in words is "two hundred forty-three million, four hundred forty thousand, thirty-nine".