3935921 has 16 divisors (see below), whose sum is σ = 4589568. Its totient is φ = 3339600.

The previous prime is 3935917. The next prime is 3935947. The reversal of 3935921 is 1295393.

3935921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3935921 - 2² = 3935917 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3935951) 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 15 ways as a sum of consecutive naturals, for example, 11726 + ... + 12056.

It is an arithmetic number, because the mean of its divisors is an integer number (286848).

Almost surely, 2^3935921 is an apocalyptic number.

It is an amenable number.

3935921 is a deficient number, since it is larger than the sum of its proper divisors (653647).

3935921 is a wasteful number, since it uses less digits than its factorization.

3935921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412.

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

The square root of 3935921 is about 1983.9155728004. The cubic root of 3935921 is about 157.8878791154.

The spelling of 3935921 in words is "three million, nine hundred thirty-five thousand, nine hundred twenty-one".