243443987 has 2 divisors, whose sum is σ = 243443988. Its totient is φ = 243443986.

The previous prime is 243443969. The next prime is 243443989. The reversal of 243443987 is 789344342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243443987 - 2¹⁰ = 243442963 is a prime.

Together with 243443989, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (243443989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121721993 + 121721994.

It is an arithmetic number, because the mean of its divisors is an integer number (121721994).

Almost surely, 2^243443987 is an apocalyptic number.

243443987 is a deficient number, since it is larger than the sum of its proper divisors (1).

243443987 is an equidigital number, since it uses as much as digits as its factorization.

243443987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 44.

The square root of 243443987 is about 15602.6916588132. The cubic root of 243443987 is about 624.4049692546.

The spelling of 243443987 in words is "two hundred forty-three million, four hundred forty-three thousand, nine hundred eighty-seven".