549018 has 20 divisors (see below), whose sum is σ = 1230570. Its totient is φ = 182952.

The previous prime is 549013. The next prime is 549019. The reversal of 549018 is 810945.

It can be written as a sum of positive squares in only one way, i.e., 321489 + 227529 = 567^2 + 477^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

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

It is a Curzon number.

It is a nialpdrome in base 7.

It is a junction number, because it is equal to n+sod(n) for n = 548982 and 549000.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 549018.

It is not an unprimeable number, because it can be changed into a prime (549011) by changing a digit.

549018 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 9 ways as a sum of consecutive naturals, for example, 1533 + ... + 1856.

2⁵⁴⁹⁰¹⁸ is an apocalyptic number.

549018 is an abundant number, since it is smaller than the sum of its proper divisors (681552).

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

549018 is a wasteful number, since it uses less digits than its factorization.

549018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3403 (or 3394 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 549018 is about 740.9574886591. The cubic root of 549018 is about 81.8833359809.

The spelling of 549018 in words is "five hundred forty-nine thousand, eighteen".