4338721 has 2 divisors, whose sum is σ = 4338722. Its totient is φ = 4338720.

The previous prime is 4338709. The next prime is 4338769. The reversal of 4338721 is 1278334.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4326400 + 12321 = 2080^2 + 111^2 .

It is a cyclic number.

It is not a de Polignac number, because 4338721 - 2¹⁵ = 4305953 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4338721.

It is not a weakly prime, because it can be changed into another prime (4338121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2169360 + 2169361.

It is an arithmetic number, because the mean of its divisors is an integer number (2169361).

Almost surely, 2^4338721 is an apocalyptic number.

It is an amenable number.

4338721 is a deficient number, since it is larger than the sum of its proper divisors (1).

4338721 is an equidigital number, since it uses as much as digits as its factorization.

4338721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 28.

The square root of 4338721 is about 2082.9596731574. The cubic root of 4338721 is about 163.0999800639.

The spelling of 4338721 in words is "four million, three hundred thirty-eight thousand, seven hundred twenty-one".