55985 has 4 divisors (see below), whose sum is σ = 67188. Its totient is φ = 44784.

The previous prime is 55967. The next prime is 55987. The reversal of 55985 is 58955.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16384 + 39601 = 128^2 + 199^2 .

It is a cyclic number.

It is not a de Polignac number, because 55985 - 2⁶ = 55921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5594 + ... + 5603.

It is an arithmetic number, because the mean of its divisors is an integer number (16797).

2⁵⁵⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

55985 is a deficient number, since it is larger than the sum of its proper divisors (11203).

55985 is a wasteful number, since it uses less digits than its factorization.

55985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11202.

The product of its digits is 9000, while the sum is 32.

The square root of 55985 is about 236.6114959168. The cubic root of 55985 is about 38.2552074019.

The spelling of 55985 in words is "fifty-five thousand, nine hundred eighty-five".