53989 has 4 divisors (see below), whose sum is σ = 58156. Its totient is φ = 49824.

The previous prime is 53987. The next prime is 53993. The reversal of 53989 is 98935.

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 3364 + 50625 = 58^2 + 225^2 .

It is a cyclic number.

It is not a de Polignac number, because 53989 - 2¹ = 53987 is a prime.

It is a Duffinian 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.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2064 + ... + 2089.

It is an arithmetic number, because the mean of its divisors is an integer number (14539).

2⁵³⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

53989 is a deficient number, since it is larger than the sum of its proper divisors (4167).

53989 is a wasteful number, since it uses less digits than its factorization.

53989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4166.

The product of its digits is 9720, while the sum is 34.

The square root of 53989 is about 232.3553313354. The cubic root of 53989 is about 37.7950648167.

The spelling of 53989 in words is "fifty-three thousand, nine hundred eighty-nine".