42186664 has 16 divisors (see below), whose sum is σ = 85184820. Its totient is φ = 19470720.

The previous prime is 42186653. The next prime is 42186667. The reversal of 42186664 is 46668124.

42186664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 42120100 + 66564 = 6490^2 + 258^2 .

It is not an unprimeable number, because it can be changed into a prime (42186667) 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, 202717 + ... + 202924.

Almost surely, 2^42186664 is an apocalyptic number.

It is an amenable number.

42186664 is an abundant number, since it is smaller than the sum of its proper divisors (42998156).

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

42186664 is a wasteful number, since it uses less digits than its factorization.

42186664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405660 (or 405656 counting only the distinct ones).

The product of its digits is 55296, while the sum is 37.

The square root of 42186664 is about 6495.1261727545. The cubic root of 42186664 is about 348.1168630283.

The spelling of 42186664 in words is "forty-two million, one hundred eighty-six thousand, six hundred sixty-four".