55040 has 36 divisors (see below), whose sum is σ = 134904. Its totient is φ = 21504.

The previous prime is 55021. The next prime is 55049. The reversal of 55040 is 4055.

It is a hoax number, since the sum of its digits (14) coincides with the sum of the digits of its distinct prime factors.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55049) by changing a digit.

55040 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1259 + ... + 1301.

2⁵⁵⁰⁴⁰ 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 55040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67452).

55040 is an abundant number, since it is smaller than the sum of its proper divisors (79864).

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

55040 is an equidigital number, since it uses as much as digits as its factorization.

55040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64 (or 50 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 14.

The square root of 55040 is about 234.6060527778. The cubic root of 55040 is about 38.0387416522.

Adding to 55040 its reverse (4055), we get a palindrome (59095).

It can be divided in two parts, 5 and 5040, that multiplied together give a triangular number (25200 = T₂₂₄).

The spelling of 55040 in words is "fifty-five thousand, forty".