551404 has 24 divisors (see below), whose sum is σ = 1128960. Its totient is φ = 230736.

The previous prime is 551387. The next prime is 551407. The reversal of 551404 is 404155.

551404 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551407) 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, 1107 + ... + 1525.

It is an arithmetic number, because the mean of its divisors is an integer number (47040).

2⁵⁵¹⁴⁰⁴ 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 551404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (564480).

551404 is an abundant number, since it is smaller than the sum of its proper divisors (577556).

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

551404 is a wasteful number, since it uses less digits than its factorization.

551404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477 (or 475 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 551404 is about 742.5658219983. The cubic root of 551404 is about 82.0017846132.

Adding to 551404 its reverse (404155), we get a palindrome (955559).

The spelling of 551404 in words is "five hundred fifty-one thousand, four hundred four".