238428121 has 2 divisors, whose sum is σ = 238428122. Its totient is φ = 238428120.

The previous prime is 238428107. The next prime is 238428137. The reversal of 238428121 is 121824832.

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., 218714521 + 19713600 = 14789^2 + 4440^2 .

It is a cyclic number.

It is not a de Polignac number, because 238428121 - 2⁵ = 238428089 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (238428191) 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, 119214060 + 119214061.

It is an arithmetic number, because the mean of its divisors is an integer number (119214061).

Almost surely, 2^238428121 is an apocalyptic number.

It is an amenable number.

238428121 is a deficient number, since it is larger than the sum of its proper divisors (1).

238428121 is an equidigital number, since it uses as much as digits as its factorization.

238428121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6144, while the sum is 31.

The square root of 238428121 is about 15441.1178675639. The cubic root of 238428121 is about 620.0868079978.

The spelling of 238428121 in words is "two hundred thirty-eight million, four hundred twenty-eight thousand, one hundred twenty-one".