531140040 has 96 divisors (see below), whose sum is σ = 1729873080. Its totient is φ = 141336576.

The previous prime is 531140033. The next prime is 531140059. The reversal of 531140040 is 40041135.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 519566436 + 11573604 = 22794^2 + 3402^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 531139995 and 531140022.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 206442 + ... + 208998.

Almost surely, 2^531140040 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 531140040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (864936540).

531140040 is an abundant number, since it is smaller than the sum of its proper divisors (1198733040).

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

531140040 is a wasteful number, since it uses less digits than its factorization.

531140040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3151 (or 3144 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 531140040 is about 23046.4756524723. The cubic root of 531140040 is about 809.8470676065.

Adding to 531140040 its reverse (40041135), we get a palindrome (571181175).

The spelling of 531140040 in words is "five hundred thirty-one million, one hundred forty thousand, forty".