42234209 has 2 divisors, whose sum is σ = 42234210. Its totient is φ = 42234208.

The previous prime is 42234197. The next prime is 42234229. The reversal of 42234209 is 90243224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31528225 + 10705984 = 5615^2 + 3272^2 .

It is a cyclic number.

It is not a de Polignac number, because 42234209 - 2¹⁶ = 42168673 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42234229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21117104 + 21117105.

It is an arithmetic number, because the mean of its divisors is an integer number (21117105).

Almost surely, 2^42234209 is an apocalyptic number.

It is an amenable number.

42234209 is a deficient number, since it is larger than the sum of its proper divisors (1).

42234209 is an equidigital number, since it uses as much as digits as its factorization.

42234209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 42234209 is about 6498.7851941728. The cubic root of 42234209 is about 348.2475915631.

The spelling of 42234209 in words is "forty-two million, two hundred thirty-four thousand, two hundred nine".