5439 has 12 divisors (see below), whose sum is σ = 8664.
Its totient is φ = 3024.
The previous prime is 5437. The next prime is 5441. The reversal of 5439 is 9345.
Adding to 5439 its sum of digits (21), we get a triangular number (5460 = T104).
It can be divided in two parts, 5 and 439, that added together give a palindrome (444).
It is an interprime number because it is at equal distance from previous prime (5437) and next prime (5441).
It is not a de Polignac number, because 5439 - 21 = 5437 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (21).
5439 is a Rhonda number in base 10.
Its product of digits (540) is a multiple of the sum of its prime factors (54).
It is a plaindrome in base 8.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (5431) by changing a digit.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 129 + ... + 165.
It is an arithmetic number, because the mean of its divisors is an integer number (722).
25439 is an apocalyptic number.
5439 is a deficient number, since it is larger than the sum of its proper divisors (3225).
5439 is a wasteful number, since it uses less digits than its factorization.
5439 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 54 (or 47 counting only the distinct ones).
The product of its digits is 540, while the sum is 21.
The square root of 5439 is about 73.7495762700.
The cubic root of 5439 is about 17.5862409683.
The spelling of 5439 in words is "five thousand, four hundred thirty-nine".