239387039789 has 2 divisors, whose sum is σ = 239387039790. Its totient is φ = 239387039788.

The previous prime is 239387039743. The next prime is 239387039791. The reversal of 239387039789 is 987930783932.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 228168628900 + 11218410889 = 477670^2 + 105917^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-239387039789 is a prime.

It is a Sophie Germain prime.

Together with 239387039791, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (239387039729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119693519894 + 119693519895.

It is an arithmetic number, because the mean of its divisors is an integer number (119693519895).

Almost surely, 2^239387039789 is an apocalyptic number.

It is an amenable number.

239387039789 is a deficient number, since it is larger than the sum of its proper divisors (1).

239387039789 is an equidigital number, since it uses as much as digits as its factorization.

239387039789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 123451776, while the sum is 68.

The spelling of 239387039789 in words is "two hundred thirty-nine billion, three hundred eighty-seven million, thirty-nine thousand, seven hundred eighty-nine".