1986878663 has 8 divisors (see below), whose sum is σ = 2477147520. Its totient is φ = 1548217080.

The previous prime is 1986878627. The next prime is 1986878669. The reversal of 1986878663 is 3668786891.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1986878663 - 2⁸ = 1986878407 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1986878596 and 1986878605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1986878669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12901733 + ... + 12901886.

It is an arithmetic number, because the mean of its divisors is an integer number (309643440).

Almost surely, 2^1986878663 is an apocalyptic number.

1986878663 is a deficient number, since it is larger than the sum of its proper divisors (490268857).

1986878663 is a wasteful number, since it uses less digits than its factorization.

1986878663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25803637.

The product of its digits is 20901888, while the sum is 62.

The square root of 1986878663 is about 44574.4171358415. The cubic root of 1986878663 is about 1257.1596941671.

The spelling of 1986878663 in words is "one billion, nine hundred eighty-six million, eight hundred seventy-eight thousand, six hundred sixty-three".