8531440 has 40 divisors (see below), whose sum is σ = 20266560. Its totient is φ = 3338496.

The previous prime is 8531429. The next prime is 8531443. The reversal of 8531440 is 441358.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8531443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2626 + ... + 4894.

It is an arithmetic number, because the mean of its divisors is an integer number (506664).

Almost surely, 2^8531440 is an apocalyptic number.

8531440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8531440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10133280).

8531440 is an abundant number, since it is smaller than the sum of its proper divisors (11735120).

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

8531440 is a wasteful number, since it uses less digits than its factorization.

8531440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2329 (or 2323 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 8531440 is about 2920.8628862033. The cubic root of 8531440 is about 204.3340675288.

Adding to 8531440 its reverse (441358), we get a palindrome (8972798).

The spelling of 8531440 in words is "eight million, five hundred thirty-one thousand, four hundred forty".