238400111 has 2 divisors, whose sum is σ = 238400112. Its totient is φ = 238400110.

The previous prime is 238400069. The next prime is 238400131. The reversal of 238400111 is 111004832.

It is an a-pointer prime, because the next prime (238400131) can be obtained adding 238400111 to its sum of digits (20).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 238400111 - 2⁶ = 238400047 is a prime.

It is a super-2 number, since 2×238400111² = 113669225849624642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (238400131) 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, 119200055 + 119200056.

It is an arithmetic number, because the mean of its divisors is an integer number (119200056).

Almost surely, 2^238400111 is an apocalyptic number.

238400111 is a deficient number, since it is larger than the sum of its proper divisors (1).

238400111 is an equidigital number, since it uses as much as digits as its factorization.

238400111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 238400111 is about 15440.2108470059. The cubic root of 238400111 is about 620.0625249118.

Adding to 238400111 its reverse (111004832), we get a palindrome (349404943).

The spelling of 238400111 in words is "two hundred thirty-eight million, four hundred thousand, one hundred eleven".