42242173 has 2 divisors, whose sum is σ = 42242174. Its totient is φ = 42242172.

The previous prime is 42242153. The next prime is 42242251. The reversal of 42242173 is 37124224.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35497764 + 6744409 = 5958^2 + 2597^2 .

It is a cyclic number.

It is not a de Polignac number, because 42242173 - 2⁵ = 42242141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42242153) 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, 21121086 + 21121087.

It is an arithmetic number, because the mean of its divisors is an integer number (21121087).

Almost surely, 2^42242173 is an apocalyptic number.

It is an amenable number.

42242173 is a deficient number, since it is larger than the sum of its proper divisors (1).

42242173 is an equidigital number, since it uses as much as digits as its factorization.

42242173 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 25.

The square root of 42242173 is about 6499.3978951900. The cubic root of 42242173 is about 348.2694795821.

Adding to 42242173 its reverse (37124224), we get a palindrome (79366397).

The spelling of 42242173 in words is "forty-two million, two hundred forty-two thousand, one hundred seventy-three".