531804 has 48 divisors (see below), whose sum is σ = 1530368. Its totient is φ = 139968.

The previous prime is 531799. The next prime is 531821. The reversal of 531804 is 408135.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an Ulam number.

It is a nialpdrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 849 + ... + 1335.

2⁵³¹⁸⁰⁴ 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 531804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (765184).

531804 is an abundant number, since it is smaller than the sum of its proper divisors (998564).

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

531804 is a wasteful number, since it uses less digits than its factorization.

531804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 514 (or 512 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 531804 is about 729.2489286931. The cubic root of 531804 is about 81.0184381132.

Adding to 531804 its reverse (408135), we get a palindrome (939939).

The spelling of 531804 in words is "five hundred thirty-one thousand, eight hundred four".