42417209 has 2 divisors, whose sum is σ = 42417210. Its totient is φ = 42417208.

The previous prime is 42417197. The next prime is 42417223. The reversal of 42417209 is 90271424.

42417209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26988025 + 15429184 = 5195^2 + 3928^2 .

It is a cyclic number.

It is not a de Polignac number, because 42417209 - 2⁸ = 42416953 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42417229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21208604 + 21208605.

It is an arithmetic number, because the mean of its divisors is an integer number (21208605).

Almost surely, 2^42417209 is an apocalyptic number.

It is an amenable number.

42417209 is a deficient number, since it is larger than the sum of its proper divisors (1).

42417209 is an equidigital number, since it uses as much as digits as its factorization.

42417209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 42417209 is about 6512.8495299677. The cubic root of 42417209 is about 348.7498501646.

The spelling of 42417209 in words is "forty-two million, four hundred seventeen thousand, two hundred nine".