3871681 has 4 divisors (see below), whose sum is σ = 4223664. Its totient is φ = 3519700.

The previous prime is 3871669. The next prime is 3871691. The reversal of 3871681 is 1861783.

3871681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3871681 - 2¹⁷ = 3740609 is a prime.

It is a super-2 number, since 2×3871681² = 29979827531522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3871601) 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 in 3 ways as a sum of consecutive naturals, for example, 175975 + ... + 175996.

It is an arithmetic number, because the mean of its divisors is an integer number (1055916).

Almost surely, 2^3871681 is an apocalyptic number.

It is an amenable number.

3871681 is a deficient number, since it is larger than the sum of its proper divisors (351983).

3871681 is a wasteful number, since it uses less digits than its factorization.

3871681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351982.

The product of its digits is 8064, while the sum is 34.

The square root of 3871681 is about 1967.6587610661. The cubic root of 3871681 is about 157.0241757570.

The spelling of 3871681 in words is "three million, eight hundred seventy-one thousand, six hundred eighty-one".