239399989 has 2 divisors, whose sum is σ = 239399990. Its totient is φ = 239399988.

The previous prime is 239399987. The next prime is 239400013. The reversal of 239399989 is 989993932.

239399989 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 can be written as a sum of positive squares in only one way, i.e., 237683889 + 1716100 = 15417^2 + 1310^2 .

It is a cyclic number.

It is not a de Polignac number, because 239399989 - 2¹ = 239399987 is a prime.

Together with 239399987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (239399983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119699994 + 119699995.

It is an arithmetic number, because the mean of its divisors is an integer number (119699995).

Almost surely, 2^239399989 is an apocalyptic number.

It is an amenable number.

239399989 is a deficient number, since it is larger than the sum of its proper divisors (1).

239399989 is an equidigital number, since it uses as much as digits as its factorization.

239399989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8503056, while the sum is 61.

The square root of 239399989 is about 15472.5559944051. Note that the first 3 decimals coincide. The cubic root of 239399989 is about 620.9281874358.

The spelling of 239399989 in words is "two hundred thirty-nine million, three hundred ninety-nine thousand, nine hundred eighty-nine".