549966 has 16 divisors (see below), whose sum is σ = 1116288. Its totient is φ = 180600.

The previous prime is 549949. The next prime is 549977. The reversal of 549966 is 669945.

It is a fibodiv number, since the Fibonacci-like sequence with seeds 54 and 9966 contains 549966 itself.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 549966.

It is an unprimeable number.

549966 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 220 + ... + 1071.

It is an arithmetic number, because the mean of its divisors is an integer number (69768).

2⁵⁴⁹⁹⁶⁶ is an apocalyptic number.

549966 is an abundant number, since it is smaller than the sum of its proper divisors (566322).

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

549966 is a wasteful number, since it uses less digits than its factorization.

549966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1367.

The product of its digits is 58320, while the sum is 39.

The square root of 549966 is about 741.5969255600. The cubic root of 549966 is about 81.9304387269.

It can be divided in two parts, 5499 and 66, that added together give a triangular number (5565 = T₁₀₅).

The spelling of 549966 in words is "five hundred forty-nine thousand, nine hundred sixty-six".