4057721 has 8 divisors (see below), whose sum is σ = 4181184. Its totient is φ = 3936240.

The previous prime is 4057699. The next prime is 4057723. The reversal of 4057721 is 1277504.

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

It is not a de Polignac number, because 4057721 - 2⁶ = 4057657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4057723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4331 + ... + 5183.

It is an arithmetic number, because the mean of its divisors is an integer number (522648).

Almost surely, 2^4057721 is an apocalyptic number.

It is an amenable number.

4057721 is a deficient number, since it is larger than the sum of its proper divisors (123463).

4057721 is an equidigital number, since it uses as much as digits as its factorization.

4057721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991.

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

The square root of 4057721 is about 2014.3785642227. The cubic root of 4057721 is about 159.5000147404.

The spelling of 4057721 in words is "four million, fifty-seven thousand, seven hundred twenty-one".