43623221 has 16 divisors (see below), whose sum is σ = 48686400. Its totient is φ = 38908800.

The previous prime is 43623197. The next prime is 43623227. The reversal of 43623221 is 12232634.

43623221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 43623221 - 2¹⁰ = 43622197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43623227) 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 15 ways as a sum of consecutive naturals, for example, 21626 + ... + 23556.

It is an arithmetic number, because the mean of its divisors is an integer number (3042900).

Almost surely, 2^43623221 is an apocalyptic number.

43623221 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

43623221 is a deficient number, since it is larger than the sum of its proper divisors (5063179).

43623221 is a wasteful number, since it uses less digits than its factorization.

43623221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2020.

The product of its digits is 1728, while the sum is 23.

The square root of 43623221 is about 6604.7877331524. The cubic root of 43623221 is about 352.0242455966.

Adding to 43623221 its reverse (12232634), we get a palindrome (55855855).

The spelling of 43623221 in words is "forty-three million, six hundred twenty-three thousand, two hundred twenty-one".