42171718 has 8 divisors (see below), whose sum is σ = 65298240. Its totient is φ = 20405640.

The previous prime is 42171707. The next prime is 42171721. The reversal of 42171718 is 81717124.

42171718 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a self number, because there is not a number n which added to its sum of digits gives 42171718.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 340033 + ... + 340156.

It is an arithmetic number, because the mean of its divisors is an integer number (8162280).

Almost surely, 2^42171718 is an apocalyptic number.

42171718 is a deficient number, since it is larger than the sum of its proper divisors (23126522).

42171718 is a wasteful number, since it uses less digits than its factorization.

42171718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680222.

The product of its digits is 3136, while the sum is 31.

The square root of 42171718 is about 6493.9755158146. The cubic root of 42171718 is about 348.0757475927.

The spelling of 42171718 in words is "forty-two million, one hundred seventy-one thousand, seven hundred eighteen".