531240 has 64 divisors (see below), whose sum is σ = 1684800. Its totient is φ = 133632.

The previous prime is 531239. The next prime is 531253. The reversal of 531240 is 42135.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a nialpdrome in base 15.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2164 + ... + 2396.

It is an arithmetic number, because the mean of its divisors is an integer number (26325).

2⁵³¹²⁴⁰ 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 531240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (842400).

531240 is an abundant number, since it is smaller than the sum of its proper divisors (1153560).

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

531240 is a wasteful number, since it uses less digits than its factorization.

531240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266 (or 262 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 531240 is about 728.8621268800. The cubic root of 531240 is about 80.9897868543.

Adding to 531240 its reverse (42135), we get a palindrome (573375).

The spelling of 531240 in words is "five hundred thirty-one thousand, two hundred forty".