549816 has 32 divisors (see below), whose sum is σ = 1420800. Its totient is φ = 177120.

The previous prime is 549767. The next prime is 549817. The reversal of 549816 is 618945.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (549817) 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, 375 + ... + 1113.

It is an arithmetic number, because the mean of its divisors is an integer number (44400).

2⁵⁴⁹⁸¹⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 549816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (710400).

549816 is an abundant number, since it is smaller than the sum of its proper divisors (870984).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

549816 is a wasteful number, since it uses less digits than its factorization.

549816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 779 (or 775 counting only the distinct ones).

The product of its digits is 8640, while the sum is 33.

The square root of 549816 is about 741.4957855578. The cubic root of 549816 is about 81.9229893674.

It can be divided in two parts, 54 and 9816, that added together give a triangular number (9870 = T₁₄₀).

The spelling of 549816 in words is "five hundred forty-nine thousand, eight hundred sixteen".