3906820 has 12 divisors (see below), whose sum is σ = 8204364. Its totient is φ = 1562720.

The previous prime is 3906811. The next prime is 3906827. The reversal of 3906820 is 286093.

3906820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 695556 + 3211264 = 834^2 + 1792^2 .

It is a super-3 number, since 3×3906820³ (a number of 21 digits) contains 333 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (3906827) 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 3 ways as a sum of consecutive naturals, for example, 97651 + ... + 97690.

It is an arithmetic number, because the mean of its divisors is an integer number (683697).

Almost surely, 2^3906820 is an apocalyptic number.

It is an amenable number.

3906820 is an abundant number, since it is smaller than the sum of its proper divisors (4297544).

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

3906820 is a wasteful number, since it uses less digits than its factorization.

3906820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195350 (or 195348 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 3906820 is about 1976.5677322065. The cubic root of 3906820 is about 157.4977911843.

The spelling of 3906820 in words is "three million, nine hundred six thousand, eight hundred twenty".