238653823 has 2 divisors, whose sum is σ = 238653824. Its totient is φ = 238653822.

The previous prime is 238653817. The next prime is 238653881. The reversal of 238653823 is 328356832.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-238653823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (238653893) 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, 119326911 + 119326912.

It is an arithmetic number, because the mean of its divisors is an integer number (119326912).

Almost surely, 2^238653823 is an apocalyptic number.

238653823 is a deficient number, since it is larger than the sum of its proper divisors (1).

238653823 is an equidigital number, since it uses as much as digits as its factorization.

238653823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 40.

The square root of 238653823 is about 15448.4246122380. The cubic root of 238653823 is about 620.2824094979.

The spelling of 238653823 in words is "two hundred thirty-eight million, six hundred fifty-three thousand, eight hundred twenty-three".