8321440 has 24 divisors (see below), whose sum is σ = 19659780. Its totient is φ = 3328512.

The previous prime is 8321429. The next prime is 8321503. The reversal of 8321440 is 441238.

It can be written as a sum of positive squares in 2 ways, for example, as 7595536 + 725904 = 2756^2 + 852^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25845 + ... + 26164.

Almost surely, 2^8321440 is an apocalyptic number.

8321440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8321440 is an abundant number, since it is smaller than the sum of its proper divisors (11338340).

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

8321440 is a wasteful number, since it uses less digits than its factorization.

8321440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52024 (or 52016 counting only the distinct ones).

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

The square root of 8321440 is about 2884.6906246598. The cubic root of 8321440 is about 202.6435703905.

Adding to 8321440 its reverse (441238), we get a palindrome (8762678).

The spelling of 8321440 in words is "eight million, three hundred twenty-one thousand, four hundred forty".