42585178 has 4 divisors (see below), whose sum is σ = 63877770. Its totient is φ = 21292588.

The previous prime is 42585173. The next prime is 42585181. The reversal of 42585178 is 87158524.

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

It can be written as a sum of positive squares in only one way, i.e., 37491129 + 5094049 = 6123^2 + 2257^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 42585178.

It is not an unprimeable number, because it can be changed into a prime (42585173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10646293 + ... + 10646296.

Almost surely, 2^42585178 is an apocalyptic number.

42585178 is a deficient number, since it is larger than the sum of its proper divisors (21292592).

42585178 is a wasteful number, since it uses less digits than its factorization.

42585178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21292591.

The product of its digits is 89600, while the sum is 40.

The square root of 42585178 is about 6525.7319895932. The cubic root of 42585178 is about 349.2095850346.

The spelling of 42585178 in words is "forty-two million, five hundred eighty-five thousand, one hundred seventy-eight".