4381891 has 8 divisors (see below), whose sum is σ = 4594464. Its totient is φ = 4171200.

The previous prime is 4381879. The next prime is 4381921. The reversal of 4381891 is 1981834.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 4381891 - 2⁵ = 4381859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4381591) 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 7 ways as a sum of consecutive naturals, for example, 6991 + ... + 7591.

It is an arithmetic number, because the mean of its divisors is an integer number (574308).

Almost surely, 2^4381891 is an apocalyptic number.

4381891 is a deficient number, since it is larger than the sum of its proper divisors (212573).

4381891 is a wasteful number, since it uses less digits than its factorization.

4381891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 941.

The product of its digits is 6912, while the sum is 34.

The square root of 4381891 is about 2093.2966822694. The cubic root of 4381891 is about 163.6391406281.

The spelling of 4381891 in words is "four million, three hundred eighty-one thousand, eight hundred ninety-one".