3913891 has 4 divisors (see below), whose sum is σ = 3987792. Its totient is φ = 3839992.

The previous prime is 3913837. The next prime is 3913907. The reversal of 3913891 is 1983193.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1983193 = 953 ⋅2081.

It is a cyclic number.

It is not a de Polignac number, because 3913891 - 2¹⁷ = 3782819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3913391) 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, 36871 + ... + 36976.

It is an arithmetic number, because the mean of its divisors is an integer number (996948).

Almost surely, 2^3913891 is an apocalyptic number.

3913891 is a deficient number, since it is larger than the sum of its proper divisors (73901).

3913891 is an equidigital number, since it uses as much as digits as its factorization.

3913891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73900.

The product of its digits is 5832, while the sum is 34.

The square root of 3913891 is about 1978.3556303152. The cubic root of 3913891 is about 157.5927529585.

The spelling of 3913891 in words is "three million, nine hundred thirteen thousand, eight hundred ninety-one".