4089891 has 8 divisors (see below), whose sum is σ = 5872720. Its totient is φ = 2516832.

The previous prime is 4089889. The next prime is 4089907. The reversal of 4089891 is 1989804.

4089891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 4089891 - 2¹ = 4089889 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 104869 = 4089891 / (4 + 0 + 8 + 9 + 8 + 9 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4089871) 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, 52396 + ... + 52473.

It is an arithmetic number, because the mean of its divisors is an integer number (734090).

Almost surely, 2^4089891 is an apocalyptic number.

4089891 is a deficient number, since it is larger than the sum of its proper divisors (1782829).

4089891 is a wasteful number, since it uses less digits than its factorization.

4089891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104885.

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 4089891 is about 2022.3478929205. The cubic root of 4089891 is about 159.9204161508.

The spelling of 4089891 in words is "four million, eighty-nine thousand, eight hundred ninety-one".