238639939 has 2 divisors, whose sum is σ = 238639940. Its totient is φ = 238639938.

The previous prime is 238639937. The next prime is 238639957. The reversal of 238639939 is 939936832.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 238639939 - 2¹ = 238639937 is a prime.

Together with 238639937, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (238639937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119319969 + 119319970.

It is an arithmetic number, because the mean of its divisors is an integer number (119319970).

Almost surely, 2^238639939 is an apocalyptic number.

238639939 is a deficient number, since it is larger than the sum of its proper divisors (1).

238639939 is an equidigital number, since it uses as much as digits as its factorization.

238639939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1889568, while the sum is 52.

The square root of 238639939 is about 15447.9752394934. The cubic root of 238639939 is about 620.2703806830.

The spelling of 238639939 in words is "two hundred thirty-eight million, six hundred thirty-nine thousand, nine hundred thirty-nine".