238821689 has 2 divisors, whose sum is σ = 238821690. Its totient is φ = 238821688.

The previous prime is 238821683. The next prime is 238821749. The reversal of 238821689 is 986128832.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131492089 + 107329600 = 11467^2 + 10360^2 .

It is a cyclic number.

It is not a de Polignac number, because 238821689 - 2²⁰ = 237773113 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (238821683) 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, 119410844 + 119410845.

It is an arithmetic number, because the mean of its divisors is an integer number (119410845).

Almost surely, 2^238821689 is an apocalyptic number.

It is an amenable number.

238821689 is a deficient number, since it is larger than the sum of its proper divisors (1).

238821689 is an equidigital number, since it uses as much as digits as its factorization.

238821689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 331776, while the sum is 47.

The square root of 238821689 is about 15453.8567678104. The cubic root of 238821689 is about 620.4278082767.

The spelling of 238821689 in words is "two hundred thirty-eight million, eight hundred twenty-one thousand, six hundred eighty-nine".