43420321 has 6 divisors (see below), whose sum is σ = 50509410. Its totient is φ = 37217376.

The previous prime is 43420319. The next prime is 43420331. The reversal of 43420321 is 12302434.

It can be written as a sum of positive squares in only one way, i.e., 29811600 + 13608721 = 5460^2 + 3689^2 .

It is not a de Polignac number, because 43420321 - 2¹ = 43420319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (43420331) 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 in 5 ways as a sum of consecutive naturals, for example, 443016 + ... + 443113.

It is an arithmetic number, because the mean of its divisors is an integer number (8418235).

Almost surely, 2^43420321 is an apocalyptic number.

It is an amenable number.

43420321 is a deficient number, since it is larger than the sum of its proper divisors (7089089).

43420321 is an equidigital number, since it uses as much as digits as its factorization.

43420321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 886143 (or 886136 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 43420321 is about 6589.4097611243. The cubic root of 43420321 is about 351.4776197165.

Adding to 43420321 its reverse (12302434), we get a palindrome (55722755).

The spelling of 43420321 in words is "forty-three million, four hundred twenty thousand, three hundred twenty-one".