3917666 has 4 divisors (see below), whose sum is σ = 5876502. Its totient is φ = 1958832.

The previous prime is 3917623. The next prime is 3917681. The reversal of 3917666 is 6667193.

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., 3916441 + 1225 = 1979^2 + 35^2 .

It is an Ulam number.

It is an unprimeable number.

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, 979415 + ... + 979418.

Almost surely, 2^3917666 is an apocalyptic number.

3917666 is a deficient number, since it is larger than the sum of its proper divisors (1958836).

3917666 is a wasteful number, since it uses less digits than its factorization.

3917666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1958835.

The product of its digits is 40824, while the sum is 38.

The square root of 3917666 is about 1979.3094755495. The cubic root of 3917666 is about 157.6434034474.

The spelling of 3917666 in words is "three million, nine hundred seventeen thousand, six hundred sixty-six".