43521056 has 48 divisors (see below), whose sum is σ = 88833024. Its totient is φ = 20976384.

The previous prime is 43521053. The next prime is 43521059. The reversal of 43521056 is 65012534.

It is an interprime number because it is at equal distance from previous prime (43521053) and next prime (43521059).

It is not an unprimeable number, because it can be changed into a prime (43521053) 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, 113441 + ... + 113823.

It is an arithmetic number, because the mean of its divisors is an integer number (1850688).

Almost surely, 2^43521056 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 43521056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44416512).

43521056 is an abundant number, since it is smaller than the sum of its proper divisors (45311968).

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

43521056 is a wasteful number, since it uses less digits than its factorization.

43521056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513 (or 505 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 43521056 is about 6597.0490372590. The cubic root of 43521056 is about 351.7492187571.

The spelling of 43521056 in words is "forty-three million, five hundred twenty-one thousand, fifty-six".