43404721 has 8 divisors (see below), whose sum is σ = 46552320. Its totient is φ = 40343472.

The previous prime is 43404719. The next prime is 43404761. The reversal of 43404721 is 12740434.

43404721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 43404721 - 2¹ = 43404719 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (43404701) 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 7 ways as a sum of consecutive naturals, for example, 20545 + ... + 22558.

It is an arithmetic number, because the mean of its divisors is an integer number (5819040).

Almost surely, 2^43404721 is an apocalyptic number.

It is an amenable number.

43404721 is a deficient number, since it is larger than the sum of its proper divisors (3147599).

43404721 is a wasteful number, since it uses less digits than its factorization.

43404721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43175.

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 43404721 is about 6588.2259372308. The cubic root of 43404721 is about 351.4355218575.

The spelling of 43404721 in words is "forty-three million, four hundred four thousand, seven hundred twenty-one".