3878681 has 2 divisors, whose sum is σ = 3878682. Its totient is φ = 3878680.

The previous prime is 3878657. The next prime is 3878687. The reversal of 3878681 is 1868783.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3705625 + 173056 = 1925^2 + 416^2 .

It is a cyclic number.

It is not a de Polignac number, because 3878681 - 2⁶ = 3878617 is a prime.

It is a super-2 number, since 2×3878681² = 30088332599522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (3878687) 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, 1939340 + 1939341.

It is an arithmetic number, because the mean of its divisors is an integer number (1939341).

Almost surely, 2^3878681 is an apocalyptic number.

It is an amenable number.

3878681 is a deficient number, since it is larger than the sum of its proper divisors (1).

3878681 is an equidigital number, since it uses as much as digits as its factorization.

3878681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 41.

The square root of 3878681 is about 1969.4367215019. The cubic root of 3878681 is about 157.1187520286.

The spelling of 3878681 in words is "three million, eight hundred seventy-eight thousand, six hundred eighty-one".