3881666 has 4 divisors (see below), whose sum is σ = 5822502. Its totient is φ = 1940832.

The previous prime is 3881659. The next prime is 3881671. The reversal of 3881666 is 6661883.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2839225 + 1042441 = 1685^2 + 1021^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 970415 + ... + 970418.

Almost surely, 2^3881666 is an apocalyptic number.

3881666 is a deficient number, since it is larger than the sum of its proper divisors (1940836).

3881666 is a wasteful number, since it uses less digits than its factorization.

3881666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1940835.

The product of its digits is 41472, while the sum is 38.

The square root of 3881666 is about 1970.1944066513. The cubic root of 3881666 is about 157.1590474464.

The spelling of 3881666 in words is "three million, eight hundred eighty-one thousand, six hundred sixty-six".