42330209 has 2 divisors, whose sum is σ = 42330210. Its totient is φ = 42330208.

The previous prime is 42330193. The next prime is 42330229. The reversal of 42330209 is 90203324.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23814400 + 18515809 = 4880^2 + 4303^2 .

It is a cyclic number.

It is not a de Polignac number, because 42330209 - 2⁴ = 42330193 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (42330229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21165104 + 21165105.

It is an arithmetic number, because the mean of its divisors is an integer number (21165105).

Almost surely, 2^42330209 is an apocalyptic number.

It is an amenable number.

42330209 is a deficient number, since it is larger than the sum of its proper divisors (1).

42330209 is an equidigital number, since it uses as much as digits as its factorization.

42330209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 42330209 is about 6506.1669975493. The cubic root of 42330209 is about 348.5112520013.

The spelling of 42330209 in words is "forty-two million, three hundred thirty thousand, two hundred nine".