3881661 has 32 divisors (see below), whose sum is σ = 6386688. Its totient is φ = 2046720.

The previous prime is 3881659. The next prime is 3881671. The reversal of 3881661 is 1661883.

It is not a de Polignac number, because 3881661 - 2¹ = 3881659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3881611) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29566 + ... + 29696.

It is an arithmetic number, because the mean of its divisors is an integer number (199584).

Almost surely, 2^3881661 is an apocalyptic number.

It is an amenable number.

3881661 is a deficient number, since it is larger than the sum of its proper divisors (2505027).

3881661 is a wasteful number, since it uses less digits than its factorization.

3881661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241.

The product of its digits is 6912, while the sum is 33.

The square root of 3881661 is about 1970.1931377406. The cubic root of 3881661 is about 157.1589799672.

The spelling of 3881661 in words is "three million, eight hundred eighty-one thousand, six hundred sixty-one".