549644 has 24 divisors (see below), whose sum is σ = 1043280. Its totient is φ = 252416.

The previous prime is 549643. The next prime is 549649. The reversal of 549644 is 446945.

It is a happy number.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 549644.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 549644.

It is not an unprimeable number, because it can be changed into a prime (549641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3944 + ... + 4080.

It is an arithmetic number, because the mean of its divisors is an integer number (43470).

2⁵⁴⁹⁶⁴⁴ is an apocalyptic number.

It is an amenable number.

549644 is a deficient number, since it is larger than the sum of its proper divisors (493636).

549644 is a wasteful number, since it uses less digits than its factorization.

549644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217 (or 215 counting only the distinct ones).

The product of its digits is 17280, while the sum is 32.

The square root of 549644 is about 741.3797947071. The cubic root of 549644 is about 81.9144457675.

Adding to 549644 its sum of digits (32), we get a triangular number (549676 = T₁₀₄₈).

The spelling of 549644 in words is "five hundred forty-nine thousand, six hundred forty-four".