550440 has 96 divisors (see below), whose sum is σ = 1965600. Its totient is φ = 132480.

The previous prime is 550439. The next prime is 550441. The reversal of 550440 is 44055.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (550439) and next prime (550441).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (550441) 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, 3891 + ... + 4029.

It is an arithmetic number, because the mean of its divisors is an integer number (20475).

2⁵⁵⁰⁴⁴⁰ 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 550440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (982800).

550440 is an abundant number, since it is smaller than the sum of its proper divisors (1415160).

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

550440 is a wasteful number, since it uses less digits than its factorization.

550440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167 (or 160 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 18.

The square root of 550440 is about 741.9164373432. The cubic root of 550440 is about 81.9539698036.

Adding to 550440 its reverse (44055), we get a palindrome (594495).

It can be divided in two parts, 550 and 440, that added together give a triangular number (990 = T₄₄).

The spelling of 550440 in words is "five hundred fifty thousand, four hundred forty".