238617823 has 2 divisors, whose sum is σ = 238617824. Its totient is φ = 238617822.

The previous prime is 238617817. The next prime is 238617833. The reversal of 238617823 is 328716832.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 238617823 - 2⁹ = 238617311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (238617833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119308911 + 119308912.

It is an arithmetic number, because the mean of its divisors is an integer number (119308912).

Almost surely, 2^238617823 is an apocalyptic number.

238617823 is a deficient number, since it is larger than the sum of its proper divisors (1).

238617823 is an equidigital number, since it uses as much as digits as its factorization.

238617823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 40.

The square root of 238617823 is about 15447.2594009423. The cubic root of 238617823 is about 620.2512188674.

Subtracting 238617823 from its reverse (328716832), we obtain a palindrome (90099009).

It can be divided in two parts, 23861 and 7823, that added together give a square (31684 = 178²).

The spelling of 238617823 in words is "two hundred thirty-eight million, six hundred seventeen thousand, eight hundred twenty-three".