3931666 has 16 divisors (see below), whose sum is σ = 6211584. Its totient is φ = 1862784.

The previous prime is 3931661. The next prime is 3931667. The reversal of 3931666 is 6661393.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3931661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5506 + ... + 6178.

It is an arithmetic number, because the mean of its divisors is an integer number (388224).

Almost surely, 2^3931666 is an apocalyptic number.

3931666 is a deficient number, since it is larger than the sum of its proper divisors (2279918).

3931666 is a wasteful number, since it uses less digits than its factorization.

3931666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825.

The product of its digits is 17496, while the sum is 34.

The square root of 3931666 is about 1982.8429085533. The cubic root of 3931666 is about 157.8309627323.

The spelling of 3931666 in words is "three million, nine hundred thirty-one thousand, six hundred sixty-six".