4423681 has 2 divisors, whose sum is σ = 4423682. Its totient is φ = 4423680.

The previous prime is 4423673. The next prime is 4423691. The reversal of 4423681 is 1863244.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3549456 + 874225 = 1884^2 + 935^2 .

It is a cyclic number.

It is not a de Polignac number, because 4423681 - 2³ = 4423673 is a prime.

It is a super-2 number, since 2×4423681² = 39137907179522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (4423691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2211840 + 2211841.

It is an arithmetic number, because the mean of its divisors is an integer number (2211841).

It is a Proth number, since it is equal to 135 ⋅ 2¹⁵ + 1 and 135 < 2¹⁵.

Almost surely, 2^4423681 is an apocalyptic number.

It is an amenable number.

4423681 is a deficient number, since it is larger than the sum of its proper divisors (1).

4423681 is an equidigital number, since it uses as much as digits as its factorization.

4423681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 28.

The square root of 4423681 is about 2103.2548585466. The cubic root of 4423681 is about 164.1577032506.

The spelling of 4423681 in words is "four million, four hundred twenty-three thousand, six hundred eighty-one".