3990646 has 16 divisors (see below), whose sum is σ = 6874560. Its totient is φ = 1718280.

The previous prime is 3990641. The next prime is 3990689. The reversal of 3990646 is 6460993.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3990641) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 4356 + ... + 5191.

It is an arithmetic number, because the mean of its divisors is an integer number (429660).

Almost surely, 2^3990646 is an apocalyptic number.

3990646 is a deficient number, since it is larger than the sum of its proper divisors (2883914).

3990646 is a wasteful number, since it uses less digits than its factorization.

3990646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9579.

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 3990646 is about 1997.6601312536. The cubic root of 3990646 is about 158.6162707056.

The spelling of 3990646 in words is "three million, nine hundred ninety thousand, six hundred forty-six".