238218923 has 2 divisors, whose sum is σ = 238218924. Its totient is φ = 238218922.

The previous prime is 238218919. The next prime is 238218947. The reversal of 238218923 is 329812832.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 238218923 - 2² = 238218919 is a prime.

It is not a weakly prime, because it can be changed into another prime (238218823) 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, 119109461 + 119109462.

It is an arithmetic number, because the mean of its divisors is an integer number (119109462).

Almost surely, 2^238218923 is an apocalyptic number.

238218923 is a deficient number, since it is larger than the sum of its proper divisors (1).

238218923 is an equidigital number, since it uses as much as digits as its factorization.

238218923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 38.

The square root of 238218923 is about 15434.3423248287. The cubic root of 238218923 is about 619.9053991980.

The spelling of 238218923 in words is "two hundred thirty-eight million, two hundred eighteen thousand, nine hundred twenty-three".