4091905 has 8 divisors (see below), whose sum is σ = 4923072. Its totient is φ = 3265008.

The previous prime is 4091873. The next prime is 4091909. The reversal of 4091905 is 5091904.

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 4091905 - 2⁵ = 4091873 is a prime.

It is a Duffinian number.

4091905 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (4091909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1702 + ... + 3328.

It is an arithmetic number, because the mean of its divisors is an integer number (615384).

It is a Proth number, since it is equal to 999 ⋅ 2¹² + 1 and 999 < 2¹².

Almost surely, 2^4091905 is an apocalyptic number.

It is an amenable number.

4091905 is a deficient number, since it is larger than the sum of its proper divisors (831167).

4091905 is a wasteful number, since it uses less digits than its factorization.

4091905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2135.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 4091905 is about 2022.8457677243. The cubic root of 4091905 is about 159.9466619085.

Subtracting 4091905 from its reverse (5091904), we obtain a palindrome (999999).

The spelling of 4091905 in words is "four million, ninety-one thousand, nine hundred five".