238138013 has 2 divisors, whose sum is σ = 238138014. Its totient is φ = 238138012.

The previous prime is 238138009. The next prime is 238138027. The reversal of 238138013 is 310831832.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 234304249 + 3833764 = 15307^2 + 1958^2 .

It is a cyclic number.

It is not a de Polignac number, because 238138013 - 2² = 238138009 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (238138093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119069006 + 119069007.

It is an arithmetic number, because the mean of its divisors is an integer number (119069007).

Almost surely, 2^238138013 is an apocalyptic number.

It is an amenable number.

238138013 is a deficient number, since it is larger than the sum of its proper divisors (1).

238138013 is an equidigital number, since it uses as much as digits as its factorization.

238138013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 238138013 is about 15431.7209992923. The cubic root of 238138013 is about 619.8352085448.

Adding to 238138013 its reverse (310831832), we get a palindrome (548969845).

The spelling of 238138013 in words is "two hundred thirty-eight million, one hundred thirty-eight thousand, thirteen".