238903993 has 2 divisors, whose sum is σ = 238903994. Its totient is φ = 238903992.

The previous prime is 238903991. The next prime is 238904033. The reversal of 238903993 is 399309832.

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., 201412864 + 37491129 = 14192^2 + 6123^2 .

It is a cyclic number.

It is not a de Polignac number, because 238903993 - 2¹ = 238903991 is a prime.

Together with 238903991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (238903991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119451996 + 119451997.

It is an arithmetic number, because the mean of its divisors is an integer number (119451997).

Almost surely, 2^238903993 is an apocalyptic number.

It is an amenable number.

238903993 is a deficient number, since it is larger than the sum of its proper divisors (1).

238903993 is an equidigital number, since it uses as much as digits as its factorization.

238903993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 314928, while the sum is 46.

The square root of 238903993 is about 15456.5194335594. The cubic root of 238903993 is about 620.4990718007.

The spelling of 238903993 in words is "two hundred thirty-eight million, nine hundred three thousand, nine hundred ninety-three".