42178085 has 8 divisors (see below), whose sum is σ = 50670456. Its totient is φ = 33704640.

The previous prime is 42178063. The next prime is 42178109. The reversal of 42178085 is 58087124.

It can be written as a sum of positive squares in 4 ways, for example, as 17833729 + 24344356 = 4223^2 + 4934^2 .

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

It is not a de Polignac number, because 42178085 - 2⁸ = 42177829 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 755 + ... + 9215.

It is an arithmetic number, because the mean of its divisors is an integer number (6333807).

Almost surely, 2^42178085 is an apocalyptic number.

It is an amenable number.

42178085 is a deficient number, since it is larger than the sum of its proper divisors (8492371).

42178085 is an equidigital number, since it uses as much as digits as its factorization.

42178085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9463.

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 42178085 is about 6494.4657209042. The cubic root of 42178085 is about 348.0932639668.

The spelling of 42178085 in words is "forty-two million, one hundred seventy-eight thousand, eighty-five".