549940 has 24 divisors (see below), whose sum is σ = 1193472. Its totient is φ = 212640.

The previous prime is 549937. The next prime is 549943. The reversal of 549940 is 49945.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (549937) and next prime (549943).

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (549943) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 177 + ... + 1063.

It is an arithmetic number, because the mean of its divisors is an integer number (49728).

2⁵⁴⁹⁹⁴⁰ 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 549940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (596736).

549940 is an abundant number, since it is smaller than the sum of its proper divisors (643532).

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

549940 is a wasteful number, since it uses less digits than its factorization.

549940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 927 (or 925 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 549940 is about 741.5793956145. The cubic root of 549940 is about 81.9291476016.

The spelling of 549940 in words is "five hundred forty-nine thousand, nine hundred forty".