8243440 has 20 divisors (see below), whose sum is σ = 19166184. Its totient is φ = 3297344.

The previous prime is 8243429. The next prime is 8243441. The reversal of 8243440 is 443428.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8243441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51442 + ... + 51601.

Almost surely, 2^8243440 is an apocalyptic number.

8243440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8243440 is an abundant number, since it is smaller than the sum of its proper divisors (10922744).

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

8243440 is a wasteful number, since it uses less digits than its factorization.

8243440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103056 (or 103050 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

The square root of 8243440 is about 2871.1391467499. The cubic root of 8243440 is about 202.0084301942.

Adding to 8243440 its reverse (443428), we get a palindrome (8686868).

The spelling of 8243440 in words is "eight million, two hundred forty-three thousand, four hundred forty".