531820 has 12 divisors (see below), whose sum is σ = 1116864. Its totient is φ = 212720.

The previous prime is 531799. The next prime is 531821. The reversal of 531820 is 28135.

It is a happy number.

It is a nialpdrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (531821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13276 + ... + 13315.

It is an arithmetic number, because the mean of its divisors is an integer number (93072).

2⁵³¹⁸²⁰ is an apocalyptic number.

It is an amenable number.

531820 is an abundant number, since it is smaller than the sum of its proper divisors (585044).

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

531820 is a wasteful number, since it uses less digits than its factorization.

531820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26600 (or 26598 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 531820 is about 729.2598988015. The cubic root of 531820 is about 81.0192506193.

Adding to 531820 its reverse (28135), we get a palindrome (559955).

The spelling of 531820 in words is "five hundred thirty-one thousand, eight hundred twenty".