239645971 has 2 divisors, whose sum is σ = 239645972. Its totient is φ = 239645970.

The previous prime is 239645953. The next prime is 239646013. The reversal of 239645971 is 179546932.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 239645971 - 2¹⁵ = 239613203 is a prime.

It is not a weakly prime, because it can be changed into another prime (239645911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119822985 + 119822986.

It is an arithmetic number, because the mean of its divisors is an integer number (119822986).

Almost surely, 2^239645971 is an apocalyptic number.

239645971 is a deficient number, since it is larger than the sum of its proper divisors (1).

239645971 is an equidigital number, since it uses as much as digits as its factorization.

239645971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408240, while the sum is 46.

The square root of 239645971 is about 15480.5029311066. The cubic root of 239645971 is about 621.1407812566.

The spelling of 239645971 in words is "two hundred thirty-nine million, six hundred forty-five thousand, nine hundred seventy-one".