4089905 has 8 divisors (see below), whose sum is σ = 4927272. Its totient is φ = 3259008.

The previous prime is 4089889. The next prime is 4089907. The reversal of 4089905 is 5099804.

4089905 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 388129 + 3701776 = 623^2 + 1924^2 .

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 4089905 - 2⁴ = 4089889 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4089907) 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, 92 + ... + 2861.

It is an arithmetic number, because the mean of its divisors is an integer number (615909).

Almost surely, 2^4089905 is an apocalyptic number.

It is an amenable number.

4089905 is a deficient number, since it is larger than the sum of its proper divisors (837367).

4089905 is a wasteful number, since it uses less digits than its factorization.

4089905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3235.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 4089905 is about 2022.3513542409. The cubic root of 4089905 is about 159.9205986237.

It can be divided in two parts, 4089 and 905, that added together give a palindrome (4994).

The spelling of 4089905 in words is "four million, eighty-nine thousand, nine hundred five".