43240321 has 2 divisors, whose sum is σ = 43240322. Its totient is φ = 43240320.

The previous prime is 43240297. The next prime is 43240339. The reversal of 43240321 is 12304234.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43046721 + 193600 = 6561^2 + 440^2 .

It is a cyclic number.

It is not a de Polignac number, because 43240321 - 2¹³ = 43232129 is a prime.

It is not a weakly prime, because it can be changed into another prime (43240721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21620160 + 21620161.

It is an arithmetic number, because the mean of its divisors is an integer number (21620161).

Almost surely, 2^43240321 is an apocalyptic number.

It is an amenable number.

43240321 is a deficient number, since it is larger than the sum of its proper divisors (1).

43240321 is an equidigital number, since it uses as much as digits as its factorization.

43240321 is an evil number, because the sum of its binary digits is even.

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

The square root of 43240321 is about 6575.7372970641. The cubic root of 43240321 is about 350.9912606759.

Adding to 43240321 its reverse (12304234), we get a palindrome (55544555).

The spelling of 43240321 in words is "forty-three million, two hundred forty thousand, three hundred twenty-one".