55140 has 24 divisors (see below), whose sum is σ = 154560. Its totient is φ = 14688.

The previous prime is 55127. The next prime is 55147. The reversal of 55140 is 4155.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a nialpdrome in base 16.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 55140.

It is not an unprimeable number, because it can be changed into a prime (55147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 400 + ... + 519.

It is an arithmetic number, because the mean of its divisors is an integer number (6440).

2⁵⁵¹⁴⁰ is an apocalyptic number.

It is an amenable number.

55140 is an abundant number, since it is smaller than the sum of its proper divisors (99420).

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 (77280).

55140 is a wasteful number, since it uses less digits than its factorization.

55140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 931 (or 929 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 15.

The square root of 55140 is about 234.8190792930. The cubic root of 55140 is about 38.0617647432.

Adding to 55140 its sum of digits (15), we get a palindrome (55155).

Adding to 55140 its reverse (4155), we get a palindrome (59295).

The spelling of 55140 in words is "fifty-five thousand, one hundred forty".