531321840 has 240 divisors, whose sum is σ = 2083580928. Its totient is φ = 118808064.

The previous prime is 531321823. The next prime is 531321877. The reversal of 531321840 is 48123135.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (240).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 235759 + ... + 238001.

Almost surely, 2^531321840 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 531321840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1041790464).

531321840 is an abundant number, since it is smaller than the sum of its proper divisors (1552259088).

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

531321840 is a wasteful number, since it uses less digits than its factorization.

531321840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2316 (or 2307 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 531321840 is about 23050.4195189589. The cubic root of 531321840 is about 809.9394559228.

Adding to 531321840 its reverse (48123135), we get a palindrome (579444975).

The spelling of 531321840 in words is "five hundred thirty-one million, three hundred twenty-one thousand, eight hundred forty".