238681489 has 2 divisors, whose sum is σ = 238681490. Its totient is φ = 238681488.

The previous prime is 238681441. The next prime is 238681501. The reversal of 238681489 is 984186832.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 230037889 + 8643600 = 15167^2 + 2940^2 .

It is a cyclic number.

It is not a de Polignac number, because 238681489 - 2⁷ = 238681361 is a prime.

It is not a weakly prime, because it can be changed into another prime (238681409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119340744 + 119340745.

It is an arithmetic number, because the mean of its divisors is an integer number (119340745).

Almost surely, 2^238681489 is an apocalyptic number.

It is an amenable number.

238681489 is a deficient number, since it is larger than the sum of its proper divisors (1).

238681489 is an equidigital number, since it uses as much as digits as its factorization.

238681489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 663552, while the sum is 49.

The square root of 238681489 is about 15449.3200173988. The cubic root of 238681489 is about 620.3063773660.

The spelling of 238681489 in words is "two hundred thirty-eight million, six hundred eighty-one thousand, four hundred eighty-nine".