243320387 has 2 divisors, whose sum is σ = 243320388. Its totient is φ = 243320386.

The previous prime is 243320377. The next prime is 243320431. The reversal of 243320387 is 783023342.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243320387 - 2⁸ = 243320131 is a prime.

It is not a weakly prime, because it can be changed into another prime (243320377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121660193 + 121660194.

It is an arithmetic number, because the mean of its divisors is an integer number (121660194).

Almost surely, 2^243320387 is an apocalyptic number.

243320387 is a deficient number, since it is larger than the sum of its proper divisors (1).

243320387 is an equidigital number, since it uses as much as digits as its factorization.

243320387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 32.

The square root of 243320387 is about 15598.7303008931. The cubic root of 243320387 is about 624.2992782494.

The spelling of 243320387 in words is "two hundred forty-three million, three hundred twenty thousand, three hundred eighty-seven".