3940005 has 16 divisors (see below), whose sum is σ = 6675264. Its totient is φ = 1977600.

The previous prime is 3939997. The next prime is 3940009. The reversal of 3940005 is 5000493.

It is not a de Polignac number, because 3940005 - 2³ = 3939997 is a prime.

It is a Curzon number.

3940005 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3940009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7471 + ... + 7980.

It is an arithmetic number, because the mean of its divisors is an integer number (417204).

Almost surely, 2^3940005 is an apocalyptic number.

It is an amenable number.

3940005 is a deficient number, since it is larger than the sum of its proper divisors (2735259).

3940005 is a wasteful number, since it uses less digits than its factorization.

3940005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15476.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 3940005 is about 1984.9445836093. The cubic root of 3940005 is about 157.9424695744.

Adding to 3940005 its reverse (5000493), we get a palindrome (8940498).

The spelling of 3940005 in words is "three million, nine hundred forty thousand, five".