3943605 has 16 divisors (see below), whose sum is σ = 6338880. Its totient is φ = 2093568.

The previous prime is 3943591. The next prime is 3943613. The reversal of 3943605 is 5063493.

It is a happy number.

It is not a de Polignac number, because 3943605 - 2¹⁰ = 3942581 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3781 + ... + 4709.

It is an arithmetic number, because the mean of its divisors is an integer number (396180).

Almost surely, 2^3943605 is an apocalyptic number.

It is an amenable number.

3943605 is a deficient number, since it is larger than the sum of its proper divisors (2395275).

3943605 is a wasteful number, since it uses less digits than its factorization.

3943605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1220.

The product of its (nonzero) digits is 9720, while the sum is 30.

The square root of 3943605 is about 1985.8512028850. The cubic root of 3943605 is about 157.9905591753.

The spelling of 3943605 in words is "three million, nine hundred forty-three thousand, six hundred five".