3909906 has 144 divisors (see below), whose sum is σ = 11950848. Its totient is φ = 907200.

The previous prime is 3909889. The next prime is 3909907. The reversal of 3909906 is 6099093.

3909906 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3909907) 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 71 ways as a sum of consecutive naturals, for example, 126111 + ... + 126141.

It is an arithmetic number, because the mean of its divisors is an integer number (82992).

Almost surely, 2^3909906 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3909906, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5975424).

3909906 is an abundant number, since it is smaller than the sum of its proper divisors (8040942).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3909906 is a wasteful number, since it uses less digits than its factorization.

3909906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77 (or 67 counting only the distinct ones).

The product of its (nonzero) digits is 13122, while the sum is 36.

The square root of 3909906 is about 1977.3482242640. The cubic root of 3909906 is about 157.5392494774.

It can be divided in two parts, 390 and 9906, that added together give a triangular number (10296 = T₁₄₃).

The spelling of 3909906 in words is "three million, nine hundred nine thousand, nine hundred six".