4387681 has 2 divisors, whose sum is σ = 4387682. Its totient is φ = 4387680.

The previous prime is 4387673. The next prime is 4387693. The reversal of 4387681 is 1867834.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2739025 + 1648656 = 1655^2 + 1284^2 .

It is a cyclic number.

It is not a de Polignac number, because 4387681 - 2³ = 4387673 is a prime.

It is a super-2 number, since 2×4387681² = 38503489115522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 4387681.

It is not a weakly prime, because it can be changed into another prime (4387661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2193840 + 2193841.

It is an arithmetic number, because the mean of its divisors is an integer number (2193841).

Almost surely, 2^4387681 is an apocalyptic number.

It is an amenable number.

4387681 is a deficient number, since it is larger than the sum of its proper divisors (1).

4387681 is an equidigital number, since it uses as much as digits as its factorization.

4387681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 37.

The square root of 4387681 is about 2094.6792117172. The cubic root of 4387681 is about 163.7111836204.

The spelling of 4387681 in words is "four million, three hundred eighty-seven thousand, six hundred eighty-one".