55239 has 4 divisors (see below), whose sum is σ = 73656. Its totient is φ = 36824.

The previous prime is 55229. The next prime is 55243. The reversal of 55239 is 93255.

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

It is a cyclic number.

It is not a de Polignac number, because 55239 - 2⁵ = 55207 is a prime.

It is a D-number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9204 + ... + 9209.

It is an arithmetic number, because the mean of its divisors is an integer number (18414).

2⁵⁵²³⁹ is an apocalyptic number.

55239 is a deficient number, since it is larger than the sum of its proper divisors (18417).

55239 is a wasteful number, since it uses less digits than its factorization.

55239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18416.

The product of its digits is 1350, while the sum is 24.

The square root of 55239 is about 235.0297853465. The cubic root of 55239 is about 38.0845301998.

It can be divided in two parts, 552 and 39, that multiplied together give a triangular number (21528 = T₂₀₇).

The spelling of 55239 in words is "fifty-five thousand, two hundred thirty-nine".