238369721 has 2 divisors, whose sum is σ = 238369722. Its totient is φ = 238369720.

The previous prime is 238369711. The next prime is 238369727. The reversal of 238369721 is 127963832.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 214212496 + 24157225 = 14636^2 + 4915^2 .

It is a cyclic number.

It is not a de Polignac number, because 238369721 - 2²⁶ = 171260857 is a prime.

It is not a weakly prime, because it can be changed into another prime (238369727) 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, 119184860 + 119184861.

It is an arithmetic number, because the mean of its divisors is an integer number (119184861).

Almost surely, 2^238369721 is an apocalyptic number.

It is an amenable number.

238369721 is a deficient number, since it is larger than the sum of its proper divisors (1).

238369721 is an equidigital number, since it uses as much as digits as its factorization.

238369721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 41.

The square root of 238369721 is about 15439.2266969560. The cubic root of 238369721 is about 620.0361763490.

The spelling of 238369721 in words is "two hundred thirty-eight million, three hundred sixty-nine thousand, seven hundred twenty-one".