523404 has 72 divisors (see below), whose sum is σ = 1584128. Its totient is φ = 142560.

The previous prime is 523403. The next prime is 523417. The reversal of 523404 is 404325.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (523403) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7779 + ... + 7845.

2⁵²³⁴⁰⁴ 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 523404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (792064).

523404 is an abundant number, since it is smaller than the sum of its proper divisors (1060724).

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

523404 is a wasteful number, since it uses less digits than its factorization.

523404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115 (or 110 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 523404 is about 723.4666543801. The cubic root of 523404 is about 80.5896022726.

Adding to 523404 its reverse (404325), we get a palindrome (927729).

It can be divided in two parts, 5 and 23404, that added together give a square (23409 = 153²).

The spelling of 523404 in words is "five hundred twenty-three thousand, four hundred four".