4091985 has 32 divisors (see below), whose sum is σ = 7706880. Its totient is φ = 2052864.

The previous prime is 4091959. The next prime is 4091993. The reversal of 4091985 is 5891904.

4091985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 4091985 - 2⁶ = 4091921 is a prime.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 1404 + ... + 3186.

It is an arithmetic number, because the mean of its divisors is an integer number (240840).

Almost surely, 2^4091985 is an apocalyptic number.

4091985 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

4091985 is a deficient number, since it is larger than the sum of its proper divisors (3614895).

4091985 is a wasteful number, since it uses less digits than its factorization.

4091985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1814 (or 1808 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 4091985 is about 2022.8655417501. The cubic root of 4091985 is about 159.9477042633.

The spelling of 4091985 in words is "four million, ninety-one thousand, nine hundred eighty-five".