8231440 has 40 divisors (see below), whose sum is σ = 21873600. Its totient is φ = 2822016.

The previous prime is 8231437. The next prime is 8231449. The reversal of 8231440 is 441328.

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

It is not an unprimeable number, because it can be changed into a prime (8231449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6790 + ... + 7909.

It is an arithmetic number, because the mean of its divisors is an integer number (546840).

Almost surely, 2^8231440 is an apocalyptic number.

8231440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8231440 is an abundant number, since it is smaller than the sum of its proper divisors (13642160).

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

8231440 is a wasteful number, since it uses less digits than its factorization.

8231440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14719 (or 14713 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 8231440 is about 2869.0486228016. The cubic root of 8231440 is about 201.9103611691.

Adding to 8231440 its reverse (441328), we get a palindrome (8672768).

The spelling of 8231440 in words is "eight million, two hundred thirty-one thousand, four hundred forty".