53986 has 4 divisors (see below), whose sum is σ = 80982. Its totient is φ = 26992.

The previous prime is 53959. The next prime is 53987. The reversal of 53986 is 68935.

53986 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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., 53361 + 625 = 231^2 + 25^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53987) by changing a digit.

53986 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13495 + ... + 13498.

2⁵³⁹⁸⁶ is an apocalyptic number.

53986 is a deficient number, since it is larger than the sum of its proper divisors (26996).

53986 is a wasteful number, since it uses less digits than its factorization.

53986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26995.

The product of its digits is 6480, while the sum is 31.

The square root of 53986 is about 232.3488756160. The cubic root of 53986 is about 37.7943647525.

It can be divided in two parts, 539 and 86, that added together give a 4-th power (625 = 5⁴).

The spelling of 53986 in words is "fifty-three thousand, nine hundred eighty-six".