238528709 has 2 divisors, whose sum is σ = 238528710. Its totient is φ = 238528708.

The previous prime is 238528657. The next prime is 238528711. The reversal of 238528709 is 907825832.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 204633025 + 33895684 = 14305^2 + 5822^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-238528709 is a prime.

Together with 238528711, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 238528709.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (238528769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119264354 + 119264355.

It is an arithmetic number, because the mean of its divisors is an integer number (119264355).

Almost surely, 2^238528709 is an apocalyptic number.

It is an amenable number.

238528709 is a deficient number, since it is larger than the sum of its proper divisors (1).

238528709 is an equidigital number, since it uses as much as digits as its factorization.

238528709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 238528709 is about 15444.3746717049. The cubic root of 238528709 is about 620.1739964305.

The spelling of 238528709 in words is "two hundred thirty-eight million, five hundred twenty-eight thousand, seven hundred nine".