238431989 has 2 divisors, whose sum is σ = 238431990. Its totient is φ = 238431988.

The previous prime is 238431971. The next prime is 238432027. The reversal of 238431989 is 989134832.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120275089 + 118156900 = 10967^2 + 10870^2 .

It is a cyclic number.

It is not a de Polignac number, because 238431989 - 2⁸ = 238431733 is a prime.

It is a super-2 number, since 2×238431989² = 113699626756992242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (238431889) 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, 119215994 + 119215995.

It is an arithmetic number, because the mean of its divisors is an integer number (119215995).

Almost surely, 2^238431989 is an apocalyptic number.

It is an amenable number.

238431989 is a deficient number, since it is larger than the sum of its proper divisors (1).

238431989 is an equidigital number, since it uses as much as digits as its factorization.

238431989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 373248, while the sum is 47.

The square root of 238431989 is about 15441.2431170551. The cubic root of 238431989 is about 620.0901611856.

The spelling of 238431989 in words is "two hundred thirty-eight million, four hundred thirty-one thousand, nine hundred eighty-nine".