3909866 has 4 divisors (see below), whose sum is σ = 5864802. Its totient is φ = 1954932.

The previous prime is 3909853. The next prime is 3909889. The reversal of 3909866 is 6689093.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6689093 = 271 ⋅24683.

It can be written as a sum of positive squares in only one way, i.e., 2019241 + 1890625 = 1421^2 + 1375^2 .

It is a Curzon 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, 977465 + ... + 977468.

Almost surely, 2^3909866 is an apocalyptic number.

3909866 is a deficient number, since it is larger than the sum of its proper divisors (1954936).

3909866 is a wasteful number, since it uses less digits than its factorization.

3909866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1954935.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 3909866 is about 1977.3381096818. The cubic root of 3909866 is about 157.5387122444.

The spelling of 3909866 in words is "three million, nine hundred nine thousand, eight hundred sixty-six".