549818 has 4 divisors (see below), whose sum is σ = 824730. Its totient is φ = 274908.

The previous prime is 549817. The next prime is 549833. The reversal of 549818 is 818945.

549818 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 818945 = 5 ⋅163789.

It can be written as a sum of positive squares in only one way, i.e., 485809 + 64009 = 697^2 + 253^2 .

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

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 549818.

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 as a sum of consecutive naturals, namely, 137453 + ... + 137456.

2⁵⁴⁹⁸¹⁸ is an apocalyptic number.

549818 is a deficient number, since it is larger than the sum of its proper divisors (274912).

549818 is a wasteful number, since it uses less digits than its factorization.

549818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274911.

The product of its digits is 11520, while the sum is 35.

The square root of 549818 is about 741.4971341819. The cubic root of 549818 is about 81.9230887011.

The spelling of 549818 in words is "five hundred forty-nine thousand, eight hundred eighteen".