42191718 has 16 divisors (see below), whose sum is σ = 84605040. Its totient is φ = 14026976.

The previous prime is 42191711. The next prime is 42191741. The reversal of 42191718 is 81719124.

42191718 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42191711) 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 7 ways as a sum of consecutive naturals, for example, 6705 + ... + 11372.

It is an arithmetic number, because the mean of its divisors is an integer number (5287815).

Almost surely, 2^42191718 is an apocalyptic number.

42191718 is an abundant number, since it is smaller than the sum of its proper divisors (42413322).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42191718 is a wasteful number, since it uses less digits than its factorization.

42191718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18471.

The product of its digits is 4032, while the sum is 33.

The square root of 42191718 is about 6495.5152220590. The cubic root of 42191718 is about 348.1307640435.

The spelling of 42191718 in words is "forty-two million, one hundred ninety-one thousand, seven hundred eighteen".