4389721 has 8 divisors (see below), whose sum is σ = 5051264. Its totient is φ = 3736800.

The previous prime is 4389691. The next prime is 4389727. The reversal of 4389721 is 1279834.

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 4389721 - 2¹¹ = 4387673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4389727) 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, 1020 + ... + 3133.

It is an arithmetic number, because the mean of its divisors is an integer number (631408).

Almost surely, 2^4389721 is an apocalyptic number.

It is an amenable number.

4389721 is a deficient number, since it is larger than the sum of its proper divisors (661543).

4389721 is a wasteful number, since it uses less digits than its factorization.

4389721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4311.

The product of its digits is 12096, while the sum is 34.

The square root of 4389721 is about 2095.1661032004. The cubic root of 4389721 is about 163.7365515440.

The spelling of 4389721 in words is "four million, three hundred eighty-nine thousand, seven hundred twenty-one".