3908021 has 8 divisors (see below), whose sum is σ = 4224024. Its totient is φ = 3594240.

The previous prime is 3908017. The next prime is 3908027. The reversal of 3908021 is 1208093.

It can be written as a sum of positive squares in 4 ways, for example, as 703921 + 3204100 = 839^2 + 1790^2 .

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

It is not a de Polignac number, because 3908021 - 2² = 3908017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3908027) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 6485 + ... + 7061.

It is an arithmetic number, because the mean of its divisors is an integer number (528003).

Almost surely, 2^3908021 is an apocalyptic number.

It is an amenable number.

3908021 is a deficient number, since it is larger than the sum of its proper divisors (316003).

3908021 is a wasteful number, since it uses less digits than its factorization.

3908021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1111.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 3908021 is about 1976.8715183340. The cubic root of 3908021 is about 157.5139283894.

The spelling of 3908021 in words is "three million, nine hundred eight thousand, twenty-one".