3818681 has 2 divisors, whose sum is σ = 3818682. Its totient is φ = 3818680.

The previous prime is 3818651. The next prime is 3818687. The reversal of 3818681 is 1868183.

It is a happy number.

3818681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2128681 + 1690000 = 1459^2 + 1300^2 .

It is an emirp because it is prime and its reverse (1868183) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3818681 - 2¹⁰ = 3817657 is a prime.

It is a super-2 number, since 2×3818681² = 29164649159522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3818687) 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, 1909340 + 1909341.

It is an arithmetic number, because the mean of its divisors is an integer number (1909341).

Almost surely, 2^3818681 is an apocalyptic number.

It is an amenable number.

3818681 is a deficient number, since it is larger than the sum of its proper divisors (1).

3818681 is an equidigital number, since it uses as much as digits as its factorization.

3818681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 35.

The square root of 3818681 is about 1954.1445698822. The cubic root of 3818681 is about 156.3043723305.

The spelling of 3818681 in words is "three million, eight hundred eighteen thousand, six hundred eighty-one".