63986 has 16 divisors (see below), whose sum is σ = 108864. Its totient is φ = 27984.

The previous prime is 63977. The next prime is 63997. The reversal of 63986 is 68936.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 545 + ... + 651.

It is an arithmetic number, because the mean of its divisors is an integer number (6804).

2⁶³⁹⁸⁶ is an apocalyptic number.

63986 is a deficient number, since it is larger than the sum of its proper divisors (44878).

63986 is a wasteful number, since it uses less digits than its factorization.

63986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145.

The product of its digits is 7776, while the sum is 32.

The square root of 63986 is about 252.9545413706. The cubic root of 63986 is about 39.9970831206.

Subtracting 63986 from its reverse (68936), we obtain a triangular number (4950 = T₉₉).

The spelling of 63986 in words is "sixty-three thousand, nine hundred eighty-six".