4075721 has 4 divisors (see below), whose sum is σ = 4389252. Its totient is φ = 3762192.

The previous prime is 4075717. The next prime is 4075723. The reversal of 4075721 is 1275704.

4075721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 978121 + 3097600 = 989^2 + 1760^2 .

It is a cyclic number.

It is not a de Polignac number, because 4075721 - 2² = 4075717 is a prime.

It is a super-2 number, since 2×4075721² = 33223003339682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4075723) 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 3 ways as a sum of consecutive naturals, for example, 156746 + ... + 156771.

It is an arithmetic number, because the mean of its divisors is an integer number (1097313).

Almost surely, 2^4075721 is an apocalyptic number.

It is an amenable number.

4075721 is a deficient number, since it is larger than the sum of its proper divisors (313531).

4075721 is a wasteful number, since it uses less digits than its factorization.

4075721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313530.

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 4075721 is about 2018.8414994744. The cubic root of 4075721 is about 159.7355135550.

The spelling of 4075721 in words is "four million, seventy-five thousand, seven hundred twenty-one".