55389 has 8 divisors (see below), whose sum is σ = 76000. Its totient is φ = 35856.

The previous prime is 55381. The next prime is 55399. The reversal of 55389 is 98355.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55389 - 2³ = 55381 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139 + ... + 360.

It is an arithmetic number, because the mean of its divisors is an integer number (9500).

2⁵⁵³⁸⁹ is an apocalyptic number.

It is an amenable number.

55389 is a deficient number, since it is larger than the sum of its proper divisors (20611).

55389 is a wasteful number, since it uses less digits than its factorization.

55389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539.

The product of its digits is 5400, while the sum is 30.

The square root of 55389 is about 235.3486774979. The cubic root of 55389 is about 38.1189715452.

It can be divided in two parts, 55 and 389, that added together give a palindrome (444).

The spelling of 55389 in words is "fifty-five thousand, three hundred eighty-nine".