549840 has 80 divisors (see below), whose sum is σ = 1785600. Its totient is φ = 139776.

The previous prime is 549839. The next prime is 549863. The reversal of 549840 is 48945.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 549798 and 549807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6921 + ... + 6999.

It is an arithmetic number, because the mean of its divisors is an integer number (22320).

2⁵⁴⁹⁸⁴⁰ 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 549840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (892800).

549840 is an abundant number, since it is smaller than the sum of its proper divisors (1235760).

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

549840 is a wasteful number, since it uses less digits than its factorization.

549840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124 (or 118 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 549840 is about 741.5119688852. The cubic root of 549840 is about 81.9241813560.

The spelling of 549840 in words is "five hundred forty-nine thousand, eight hundred forty".