3985509 has 32 divisors (see below), whose sum is σ = 6220800. Its totient is φ = 2245760.

The previous prime is 3985469. The next prime is 3985511. The reversal of 3985509 is 9055893.

3985509 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 3985509 - 2¹¹ = 3983461 is a prime.

3985509 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3985519) 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 31 ways as a sum of consecutive naturals, for example, 44737 + ... + 44825.

It is an arithmetic number, because the mean of its divisors is an integer number (194400).

Almost surely, 2^3985509 is an apocalyptic number.

It is an amenable number.

3985509 is a deficient number, since it is larger than the sum of its proper divisors (2235291).

3985509 is a wasteful number, since it uses less digits than its factorization.

3985509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185.

The product of its (nonzero) digits is 48600, while the sum is 39.

The square root of 3985509 is about 1996.3739629639. The cubic root of 3985509 is about 158.5481813405.

The spelling of 3985509 in words is "three million, nine hundred eighty-five thousand, five hundred nine".