42178165 has 4 divisors (see below), whose sum is σ = 50613804. Its totient is φ = 33742528.

The previous prime is 42178163. The next prime is 42178177. The reversal of 42178165 is 56187124.

42178165 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7214596 + 34963569 = 2686^2 + 5913^2 .

It is a cyclic number.

It is not a de Polignac number, because 42178165 - 2¹ = 42178163 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42178165.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42178163) 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 3 ways as a sum of consecutive naturals, for example, 4217812 + ... + 4217821.

It is an arithmetic number, because the mean of its divisors is an integer number (12653451).

Almost surely, 2^42178165 is an apocalyptic number.

It is an amenable number.

42178165 is a deficient number, since it is larger than the sum of its proper divisors (8435639).

42178165 is an equidigital number, since it uses as much as digits as its factorization.

42178165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8435638.

The product of its digits is 13440, while the sum is 34.

The square root of 42178165 is about 6494.4718799915. The cubic root of 42178165 is about 348.0934840451.

The spelling of 42178165 in words is "forty-two million, one hundred seventy-eight thousand, one hundred sixty-five".