3908891 has 4 divisors (see below), whose sum is σ = 4467312. Its totient is φ = 3350472.

The previous prime is 3908887. The next prime is 3908893. The reversal of 3908891 is 1988093.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1988093 = 193 ⋅10301.

It is a cyclic number.

It is not a de Polignac number, because 3908891 - 2² = 3908887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3908893) 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 3 ways as a sum of consecutive naturals, for example, 279200 + ... + 279213.

It is an arithmetic number, because the mean of its divisors is an integer number (1116828).

Almost surely, 2^3908891 is an apocalyptic number.

3908891 is a deficient number, since it is larger than the sum of its proper divisors (558421).

3908891 is an equidigital number, since it uses as much as digits as its factorization.

3908891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558420.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 3908891 is about 1977.0915507381. The cubic root of 3908891 is about 157.5256160569.

The spelling of 3908891 in words is "three million, nine hundred eight thousand, eight hundred ninety-one".