549540 has 72 divisors (see below), whose sum is σ = 1729728. Its totient is φ = 141120.

The previous prime is 549533. The next prime is 549547. The reversal of 549540 is 45945.

It is an interprime number because it is at equal distance from previous prime (549533) and next prime (549547).

It is not an unprimeable number, because it can be changed into a prime (549547) 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 23 ways as a sum of consecutive naturals, for example, 7705 + ... + 7775.

It is an arithmetic number, because the mean of its divisors is an integer number (24024).

2⁵⁴⁹⁵⁴⁰ 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 549540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (864864).

549540 is an abundant number, since it is smaller than the sum of its proper divisors (1180188).

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

549540 is a wasteful number, since it uses less digits than its factorization.

549540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129 (or 124 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 549540 is about 741.3096518999. The cubic root of 549540 is about 81.9092790052.

It can be divided in two parts, 549 and 540, that added together give a square (1089 = 33²).

The spelling of 549540 in words is "five hundred forty-nine thousand, five hundred forty".