550404 has 18 divisors (see below), whose sum is σ = 1391390. Its totient is φ = 183456.

The previous prime is 550379. The next prime is 550427. The reversal of 550404 is 404055.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 492804 + 57600 = 702^2 + 240^2 .

It is a tau number, because it is divible by the number of its divisors (18).

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

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7609 + ... + 7680.

2⁵⁵⁰⁴⁰⁴ is an apocalyptic number.

It is an amenable number.

550404 is an abundant number, since it is smaller than the sum of its proper divisors (840986).

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

550404 is a wasteful number, since it uses less digits than its factorization.

550404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15299 (or 15294 counting only the distinct ones).

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

The square root of 550404 is about 741.8921754541. The cubic root of 550404 is about 81.9521831073.

Adding to 550404 its reverse (404055), we get a palindrome (954459).

The spelling of 550404 in words is "five hundred fifty thousand, four hundred four".