4385721 has 8 divisors (see below), whose sum is σ = 6005824. Its totient is φ = 2844720.

The previous prime is 4385701. The next prime is 4385743. The reversal of 4385721 is 1275834.

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

It is not a de Polignac number, because 4385721 - 2⁹ = 4385209 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4385701) 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, 19645 + ... + 19866.

It is an arithmetic number, because the mean of its divisors is an integer number (750728).

Almost surely, 2^4385721 is an apocalyptic number.

It is an amenable number.

4385721 is a deficient number, since it is larger than the sum of its proper divisors (1620103).

4385721 is a wasteful number, since it uses less digits than its factorization.

4385721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39551.

The product of its digits is 6720, while the sum is 30.

The square root of 4385721 is about 2094.2113073900. The cubic root of 4385721 is about 163.6868031097.

The spelling of 4385721 in words is "four million, three hundred eighty-five thousand, seven hundred twenty-one".