3549 has 12 divisors (see below), whose sum is σ = 5856.
Its totient is φ = 1872.
The previous prime is 3547. The next prime is 3557. The reversal of 3549 is 9453.
Adding to 3549 its sum of digits (21), we get a triangular number (3570 = T84).
Multipling 3549 by its sum of digits (21), we get a square (74529 = 2732).
3549 divided by its sum of digits (21) gives a square (169 = 132).
It can be divided in two parts, 354 and 9, that added together give a palindrome (363).
3549 is nontrivially palindromic in base 16.
It is not a de Polignac number, because 3549 - 21 = 3547 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (21).
It is an Ulam number.
3549 is an undulating number in base 4.
Its product of digits (540) is a multiple of the sum of its prime factors (36).
3549 is a nontrivial repdigit in base 16.
It is a plaindrome in base 16.
It is a nialpdrome in base 16.
It is a zygodrome in base 16.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (3541) 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, 267 + ... + 279.
It is an arithmetic number, because the mean of its divisors is an integer number (488).
3549 is a gapful number since it is divisible by the number (39) formed by its first and last digit.
It is an amenable number.
3549 is a deficient number, since it is larger than the sum of its proper divisors (2307).
3549 is a wasteful number, since it uses less digits than its factorization.
3549 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 36 (or 23 counting only the distinct ones).
The product of its digits is 540, while the sum is 21.
The square root of 3549 is about 59.5734840344.
The cubic root of 3549 is about 15.2534704992.
The spelling of 3549 in words is "three thousand, five hundred forty-nine".