43828321 has 2 divisors, whose sum is σ = 43828322. Its totient is φ = 43828320.

The previous prime is 43828319. The next prime is 43828333. The reversal of 43828321 is 12382834.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34093921 + 9734400 = 5839^2 + 3120^2 .

It is a cyclic number.

It is not a de Polignac number, because 43828321 - 2¹ = 43828319 is a prime.

Together with 43828319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (43828361) 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 as a sum of consecutive naturals, namely, 21914160 + 21914161.

It is an arithmetic number, because the mean of its divisors is an integer number (21914161).

Almost surely, 2^43828321 is an apocalyptic number.

It is an amenable number.

43828321 is a deficient number, since it is larger than the sum of its proper divisors (1).

43828321 is an equidigital number, since it uses as much as digits as its factorization.

43828321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 31.

The square root of 43828321 is about 6620.2961414124. The cubic root of 43828321 is about 352.5750784868.

The spelling of 43828321 in words is "forty-three million, eight hundred twenty-eight thousand, three hundred twenty-one".