3905005 has 8 divisors (see below), whose sum is σ = 5046552. Its totient is φ = 2883648.

The previous prime is 3905003. The next prime is 3905023. The reversal of 3905005 is 5005093.

It can be written as a sum of positive squares in 4 ways, for example, as 20164 + 3884841 = 142^2 + 1971^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3905005 - 2¹ = 3905003 is a prime.

It is a Duffinian number.

3905005 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3905003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29974 + ... + 30103.

It is an arithmetic number, because the mean of its divisors is an integer number (630819).

Almost surely, 2^3905005 is an apocalyptic number.

It is an amenable number.

3905005 is a deficient number, since it is larger than the sum of its proper divisors (1141547).

3905005 is a wasteful number, since it uses less digits than its factorization.

3905005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60095.

The product of its (nonzero) digits is 675, while the sum is 22.

The square root of 3905005 is about 1976.1085496500. The cubic root of 3905005 is about 157.4733977074.

The spelling of 3905005 in words is "three million, nine hundred five thousand, five".