42018173 has 2 divisors, whose sum is σ = 42018174. Its totient is φ = 42018172.

The previous prime is 42018161. The next prime is 42018209. The reversal of 42018173 is 37181024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42016324 + 1849 = 6482^2 + 43^2 .

It is a cyclic number.

It is not a de Polignac number, because 42018173 - 2⁴ = 42018157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42018103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21009086 + 21009087.

It is an arithmetic number, because the mean of its divisors is an integer number (21009087).

Almost surely, 2^42018173 is an apocalyptic number.

It is an amenable number.

42018173 is a deficient number, since it is larger than the sum of its proper divisors (1).

42018173 is an equidigital number, since it uses as much as digits as its factorization.

42018173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 42018173 is about 6482.1426241637. The cubic root of 42018173 is about 347.6527920469.

Adding to 42018173 its reverse (37181024), we get a palindrome (79199197).

The spelling of 42018173 in words is "forty-two million, eighteen thousand, one hundred seventy-three".