4091889 has 4 divisors (see below), whose sum is σ = 5455856. Its totient is φ = 2727924.

The previous prime is 4091873. The next prime is 4091909. The reversal of 4091889 is 9881904.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 4091889 - 2⁴ = 4091873 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4091809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 681979 + ... + 681984.

It is an arithmetic number, because the mean of its divisors is an integer number (1363964).

Almost surely, 2^4091889 is an apocalyptic number.

It is an amenable number.

4091889 is a deficient number, since it is larger than the sum of its proper divisors (1363967).

4091889 is a wasteful number, since it uses less digits than its factorization.

4091889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1363966.

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

The square root of 4091889 is about 2022.8418128959. The cubic root of 4091889 is about 159.9464534360.

The spelling of 4091889 in words is "four million, ninety-one thousand, eight hundred eighty-nine".