238642009 has 2 divisors, whose sum is σ = 238642010. Its totient is φ = 238642008.

The previous prime is 238642003. The next prime is 238642013. The reversal of 238642009 is 900246832.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 232867600 + 5774409 = 15260^2 + 2403^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-238642009 is a prime.

It is not a weakly prime, because it can be changed into another prime (238642003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119321004 + 119321005.

It is an arithmetic number, because the mean of its divisors is an integer number (119321005).

Almost surely, 2^238642009 is an apocalyptic number.

It is an amenable number.

238642009 is a deficient number, since it is larger than the sum of its proper divisors (1).

238642009 is an equidigital number, since it uses as much as digits as its factorization.

238642009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 238642009 is about 15448.0422384197. The cubic root of 238642009 is about 620.2721741184.

The spelling of 238642009 in words is "two hundred thirty-eight million, six hundred forty-two thousand, nine".