3990666 has 8 divisors (see below), whose sum is σ = 7981344. Its totient is φ = 1330220.

The previous prime is 3990641. The next prime is 3990689. The reversal of 3990666 is 6660993.

3990666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

3990666 is an admirable number.

It is a Curzon number.

It is a nialpdrome in base 13.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 332550 + ... + 332561.

It is an arithmetic number, because the mean of its divisors is an integer number (997668).

Almost surely, 2^3990666 is an apocalyptic number.

3990666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3990666 is a wasteful number, since it uses less digits than its factorization.

3990666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665116.

The product of its (nonzero) digits is 52488, while the sum is 39.

The square root of 3990666 is about 1997.6651371038. The cubic root of 3990666 is about 158.6165356853.

It can be divided in two parts, 3990 and 666, that added together give a triangular number (4656 = T₉₆).

The spelling of 3990666 in words is "three million, nine hundred ninety thousand, six hundred sixty-six".