3905906 has 32 divisors (see below), whose sum is σ = 6652800. Its totient is φ = 1710720.

The previous prime is 3905879. The next prime is 3905911. The reversal of 3905906 is 6095093.

3905906 = T₁₈₈ + T₁₈₉ + ... + T₃₁₀.

It is a super-2 number, since 2×3905906² = 30512203361672, which contains 22 as substring.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 35780 + ... + 35888.

It is an arithmetic number, because the mean of its divisors is an integer number (207900).

Almost surely, 2^3905906 is an apocalyptic number.

3905906 is a deficient number, since it is larger than the sum of its proper divisors (2746894).

3905906 is a wasteful number, since it uses less digits than its factorization.

3905906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194.

The product of its (nonzero) digits is 7290, while the sum is 32.

The square root of 3905906 is about 1976.3365098080. The cubic root of 3905906 is about 157.4855080308.

The spelling of 3905906 in words is "three million, nine hundred five thousand, nine hundred six".