238616857 has 2 divisors, whose sum is σ = 238616858. Its totient is φ = 238616856.

The previous prime is 238616849. The next prime is 238616869. The reversal of 238616857 is 758616832.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126765081 + 111851776 = 11259^2 + 10576^2 .

It is a cyclic number.

It is not a de Polignac number, because 238616857 - 2³ = 238616849 is a prime.

It is not a weakly prime, because it can be changed into another prime (238616837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119308428 + 119308429.

It is an arithmetic number, because the mean of its divisors is an integer number (119308429).

Almost surely, 2^238616857 is an apocalyptic number.

It is an amenable number.

238616857 is a deficient number, since it is larger than the sum of its proper divisors (1).

238616857 is an equidigital number, since it uses as much as digits as its factorization.

238616857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 483840, while the sum is 46.

The square root of 238616857 is about 15447.2281332283. The cubic root of 238616857 is about 620.2503818756.

The spelling of 238616857 in words is "two hundred thirty-eight million, six hundred sixteen thousand, eight hundred fifty-seven".