3919891 has 4 divisors (see below), whose sum is σ = 4025872. Its totient is φ = 3813912.

The previous prime is 3919889. The next prime is 3919897. The reversal of 3919891 is 1989193.

3919891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3919891 - 2¹ = 3919889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3919897) 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, 52935 + ... + 53008.

It is an arithmetic number, because the mean of its divisors is an integer number (1006468).

Almost surely, 2^3919891 is an apocalyptic number.

3919891 is a deficient number, since it is larger than the sum of its proper divisors (105981).

3919891 is a wasteful number, since it uses less digits than its factorization.

3919891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105980.

The product of its digits is 17496, while the sum is 40.

The square root of 3919891 is about 1979.8714604741. The cubic root of 3919891 is about 157.6732418079.

The spelling of 3919891 in words is "three million, nine hundred nineteen thousand, eight hundred ninety-one".