239809189 has 2 divisors, whose sum is σ = 239809190. Its totient is φ = 239809188.

The previous prime is 239809187. The next prime is 239809243. The reversal of 239809189 is 981908932.

239809189 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., 204204100 + 35605089 = 14290^2 + 5967^2 .

It is a cyclic number.

It is not a de Polignac number, because 239809189 - 2¹ = 239809187 is a prime.

Together with 239809187, 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 (239809183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119904594 + 119904595.

It is an arithmetic number, because the mean of its divisors is an integer number (119904595).

Almost surely, 2^239809189 is an apocalyptic number.

It is an amenable number.

239809189 is a deficient number, since it is larger than the sum of its proper divisors (1).

239809189 is an equidigital number, since it uses as much as digits as its factorization.

239809189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 49.

The square root of 239809189 is about 15485.7737617466. The cubic root of 239809189 is about 621.2817647082.

The spelling of 239809189 in words is "two hundred thirty-nine million, eight hundred nine thousand, one hundred eighty-nine".