549870 has 16 divisors (see below), whose sum is σ = 1319760. Its totient is φ = 146624.

The previous prime is 549863. The next prime is 549877. The reversal of 549870 is 78945.

It is an interprime number because it is at equal distance from previous prime (549863) and next prime (549877).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (549877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9135 + ... + 9194.

It is an arithmetic number, because the mean of its divisors is an integer number (82485).

2⁵⁴⁹⁸⁷⁰ is an apocalyptic number.

549870 is an abundant number, since it is smaller than the sum of its proper divisors (769890).

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

549870 is a wasteful number, since it uses less digits than its factorization.

549870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18339.

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 549870 is about 741.5321975478. The cubic root of 549870 is about 81.9256712929.

The spelling of 549870 in words is "five hundred forty-nine thousand, eight hundred seventy".