11439 has 12 divisors (see below), whose sum is σ = 17472. Its totient is φ = 7200.
The previous prime is 11437. The next prime is 11443. The reversal of 11439 is 93411.
It is not a de Polignac number, because 11439 - 21 = 11437 is a prime.
11439 is a lucky number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (11437) 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, 259 + ... + 299.
It is an arithmetic number, because the mean of its divisors is an integer number (1456).
11439 is a Friedman number, since it can be written as 41*31*9, using all its digits and the basic arithmetic operations.
211439 is an apocalyptic number.
11439 is a deficient number, since it is larger than the sum of its proper divisors (6033).
11439 is a wasteful number, since it uses less digits than its factorization.
11439 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 78 (or 75 counting only the distinct ones).
The product of its digits is 108, while the sum is 18.
The square root of 11439 is about 106.9532608199. The cubic root of 11439 is about 22.5318068673.
It can be divided in two parts, 114 and 39, that added together give a triangular number (153 = T17).
The spelling of 11439 in words is "eleven thousand, four hundred thirty-nine".
• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.064 sec. • engine limits •