4437721 has 2 divisors, whose sum is σ = 4437722. Its totient is φ = 4437720.

The previous prime is 4437709. The next prime is 4437733. The reversal of 4437721 is 1277344.

It is a balanced prime because it is at equal distance from previous prime (4437709) and next prime (4437733).

It can be written as a sum of positive squares in only one way, i.e., 3459600 + 978121 = 1860^2 + 989^2 .

It is a cyclic number.

It is not a de Polignac number, because 4437721 - 2⁷ = 4437593 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4437721.

It is not a weakly prime, because it can be changed into another prime (4437701) 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 as a sum of consecutive naturals, namely, 2218860 + 2218861.

It is an arithmetic number, because the mean of its divisors is an integer number (2218861).

Almost surely, 2^4437721 is an apocalyptic number.

It is an amenable number.

4437721 is a deficient number, since it is larger than the sum of its proper divisors (1).

4437721 is an equidigital number, since it uses as much as digits as its factorization.

4437721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4704, while the sum is 28.

The square root of 4437721 is about 2106.5898983903. The cubic root of 4437721 is about 164.3311892475.

The spelling of 4437721 in words is "four million, four hundred thirty-seven thousand, seven hundred twenty-one".