4091005 has 8 divisors (see below), whose sum is σ = 4958424. Its totient is φ = 3240000.

The previous prime is 4090997. The next prime is 4091011. The reversal of 4091005 is 5001904.

It can be written as a sum of positive squares in 4 ways, for example, as 2883204 + 1207801 = 1698^2 + 1099^2 .

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

It is not a de Polignac number, because 4091005 - 2³ = 4090997 is a prime.

It is a Duffinian number.

4091005 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3546 + ... + 4555.

It is an arithmetic number, because the mean of its divisors is an integer number (619803).

Almost surely, 2^4091005 is an apocalyptic number.

It is an amenable number.

4091005 is a deficient number, since it is larger than the sum of its proper divisors (867419).

4091005 is a wasteful number, since it uses less digits than its factorization.

4091005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8207.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 4091005 is about 2022.6232966126. The cubic root of 4091005 is about 159.9349344816.

Adding to 4091005 its reverse (5001904), we get a palindrome (9092909).

The spelling of 4091005 in words is "four million, ninety-one thousand, five".