55540 has 12 divisors (see below), whose sum is σ = 116676. Its totient is φ = 22208.

The previous prime is 55529. The next prime is 55541. The reversal of 55540 is 4555.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 13924 + 41616 = 118^2 + 204^2 .

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1369 + ... + 1408.

It is an arithmetic number, because the mean of its divisors is an integer number (9723).

2⁵⁵⁵⁴⁰ is an apocalyptic number.

It is an amenable number.

55540 is an abundant number, since it is smaller than the sum of its proper divisors (61136).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58338).

55540 is a wasteful number, since it uses less digits than its factorization.

55540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2786 (or 2784 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 19.

The square root of 55540 is about 235.6692597689. The cubic root of 55540 is about 38.1535797528.

It can be divided in two parts, 555 and 40, that added together give a palindrome (595).

The spelling of 55540 in words is "fifty-five thousand, five hundred forty".