3920661 has 12 divisors (see below), whose sum is σ = 5683392. Its totient is φ = 2604456.

The previous prime is 3920629. The next prime is 3920677. The reversal of 3920661 is 1660293.

It is a happy number.

It is not a de Polignac number, because 3920661 - 2⁵ = 3920629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3920681) 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 11 ways as a sum of consecutive naturals, for example, 2710 + ... + 3896.

It is an arithmetic number, because the mean of its divisors is an integer number (473616).

Almost surely, 2^3920661 is an apocalyptic number.

It is an amenable number.

3920661 is a deficient number, since it is larger than the sum of its proper divisors (1762731).

3920661 is a wasteful number, since it uses less digits than its factorization.

3920661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1560 (or 1557 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 3920661 is about 1980.0659079940. The cubic root of 3920661 is about 157.6835652622.

The spelling of 3920661 in words is "three million, nine hundred twenty thousand, six hundred sixty-one".