65986 has 4 divisors (see below), whose sum is σ = 98982. Its totient is φ = 32992.

The previous prime is 65983. The next prime is 65993. The reversal of 65986 is 68956.

65986 is nontrivially palindromic in base 15.

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., 65025 + 961 = 255^2 + 31^2 .

It is not an unprimeable number, because it can be changed into a prime (65981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16495 + ... + 16498.

2⁶⁵⁹⁸⁶ is an apocalyptic number.

65986 is a deficient number, since it is larger than the sum of its proper divisors (32996).

65986 is a wasteful number, since it uses less digits than its factorization.

65986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32995.

The product of its digits is 12960, while the sum is 34.

The square root of 65986 is about 256.8774026652. The cubic root of 65986 is about 40.4095425617.

The spelling of 65986 in words is "sixty-five thousand, nine hundred eighty-six".