63840186 has 12 divisors (see below), whose sum is σ = 138320442. Its totient is φ = 21280056.

The previous prime is 63840149. The next prime is 63840187. The reversal of 63840186 is 68104836.

It is a happy number.

63840186 is a `hidden beast` number, since 638 + 4 + 0 + 18 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 52490025 + 11350161 = 7245^2 + 3369^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 63840186.

It is not an unprimeable number, because it can be changed into a prime (63840187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1773321 + ... + 1773356.

Almost surely, 2^63840186 is an apocalyptic number.

63840186 is an abundant number, since it is smaller than the sum of its proper divisors (74480256).

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

63840186 is a wasteful number, since it uses less digits than its factorization.

63840186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3546685 (or 3546682 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 63840186 is about 7990.0053817253. The cubic root of 63840186 is about 399.6667766492. Note that the first 3 decimals are identical.

The spelling of 63840186 in words is "sixty-three million, eight hundred forty thousand, one hundred eighty-six".