8440256 has 56 divisors (see below), whose sum is σ = 19263360. Its totient is φ = 3628800.

The previous prime is 8440249. The next prime is 8440259. The reversal of 8440256 is 6520448.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8440259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13061 + ... + 13691.

Almost surely, 2^8440256 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 8440256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9631680).

8440256 is an abundant number, since it is smaller than the sum of its proper divisors (10823104).

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

8440256 is a wasteful number, since it uses less digits than its factorization.

8440256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673 (or 663 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 29.

The square root of 8440256 is about 2905.2118683497. The cubic root of 8440256 is about 203.6034845649.

The spelling of 8440256 in words is "eight million, four hundred forty thousand, two hundred fifty-six".