51986 has 16 divisors (see below), whose sum is σ = 90720. Its totient is φ = 22080.

The previous prime is 51977. The next prime is 51991. The reversal of 51986 is 68915.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 305 + ... + 443.

It is an arithmetic number, because the mean of its divisors is an integer number (5670).

2⁵¹⁹⁸⁶ is an apocalyptic number.

51986 is a deficient number, since it is larger than the sum of its proper divisors (38734).

51986 is a wasteful number, since it uses less digits than its factorization.

51986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169.

The product of its digits is 2160, while the sum is 29.

The square root of 51986 is about 228.0043859227. The cubic root of 51986 is about 37.3217615780.

It can be divided in two parts, 5 and 1986, that added together give a palindrome (1991).

The spelling of 51986 in words is "fifty-one thousand, nine hundred eighty-six".