3961605 has 16 divisors (see below), whose sum is σ = 6399360. Its totient is φ = 2092608.

The previous prime is 3961597. The next prime is 3961609. The reversal of 3961605 is 5061693.

It is a happy number.

3961605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3961605 - 2³ = 3961597 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3961609) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 424 + ... + 2846.

It is an arithmetic number, because the mean of its divisors is an integer number (399960).

Almost surely, 2^3961605 is an apocalyptic number.

It is an amenable number.

3961605 is a deficient number, since it is larger than the sum of its proper divisors (2437755).

3961605 is a wasteful number, since it uses less digits than its factorization.

3961605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2540.

The product of its (nonzero) digits is 4860, while the sum is 30.

The square root of 3961605 is about 1990.3781047831. The cubic root of 3961605 is about 158.2305692047.

The spelling of 3961605 in words is "three million, nine hundred sixty-one thousand, six hundred five".