4388721 has 8 divisors (see below), whose sum is σ = 5863584. Its totient is φ = 2919840.

The previous prime is 4388711. The next prime is 4388731. The reversal of 4388721 is 1278834.

It is an interprime number because it is at equal distance from previous prime (4388711) and next prime (4388731).

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

It is not a de Polignac number, because 4388721 - 2⁵ = 4388689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4388711) 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, 666 + ... + 3036.

It is an arithmetic number, because the mean of its divisors is an integer number (732948).

Almost surely, 2^4388721 is an apocalyptic number.

It is an amenable number.

4388721 is a deficient number, since it is larger than the sum of its proper divisors (1474863).

4388721 is a wasteful number, since it uses less digits than its factorization.

4388721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2991.

The product of its digits is 10752, while the sum is 33.

The square root of 4388721 is about 2094.9274450443. The cubic root of 4388721 is about 163.7241172696.

The spelling of 4388721 in words is "four million, three hundred eighty-eight thousand, seven hundred twenty-one".