43040321 has 8 divisors (see below), whose sum is σ = 44725800. Its totient is φ = 41368320.

The previous prime is 43040303. The next prime is 43040329. The reversal of 43040321 is 12304034.

It can be written as a sum of positive squares in 4 ways, for example, as 28302400 + 14737921 = 5320^2 + 3839^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43040321 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 43040321.

It is not an unprimeable number, because it can be changed into a prime (43040329) 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 7 ways as a sum of consecutive naturals, for example, 3401 + ... + 9881.

It is an arithmetic number, because the mean of its divisors is an integer number (5590725).

Almost surely, 2^43040321 is an apocalyptic number.

It is an amenable number.

43040321 is a deficient number, since it is larger than the sum of its proper divisors (1685479).

43040321 is a wasteful number, since it uses less digits than its factorization.

43040321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6739.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 43040321 is about 6560.5122513414. The cubic root of 43040321 is about 350.4492761030.

Adding to 43040321 its reverse (12304034), we get a palindrome (55344355).

The spelling of 43040321 in words is "forty-three million, forty thousand, three hundred twenty-one".