42171717 has 16 divisors (see below), whose sum is σ = 64466432. Its totient is φ = 24021360.

The previous prime is 42171707. The next prime is 42171721. The reversal of 42171717 is 71717124.

42171717 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42171717 - 2¹⁹ = 41647429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42171707) 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 in 15 ways as a sum of consecutive naturals, for example, 3918 + ... + 9984.

It is an arithmetic number, because the mean of its divisors is an integer number (4029152).

Almost surely, 2^42171717 is an apocalyptic number.

It is an amenable number.

42171717 is a deficient number, since it is larger than the sum of its proper divisors (22294715).

42171717 is a wasteful number, since it uses less digits than its factorization.

42171717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6408.

The product of its digits is 2744, while the sum is 30.

The square root of 42171717 is about 6493.9754388202. The cubic root of 42171717 is about 348.0757448415.

It can be divided in two parts, 4 and 2171717, that multiplied together give a palindrome (8686868).

The spelling of 42171717 in words is "forty-two million, one hundred seventy-one thousand, seven hundred seventeen".