3985845 has 16 divisors (see below), whose sum is σ = 6402240. Its totient is φ = 2117504.

The previous prime is 3985843. The next prime is 3985853. The reversal of 3985845 is 5485893.

It is a cyclic number.

It is not a de Polignac number, because 3985845 - 2¹ = 3985843 is a prime.

3985845 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 3985797 and 3985806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3985843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6721 + ... + 7289.

It is an arithmetic number, because the mean of its divisors is an integer number (400140).

Almost surely, 2^3985845 is an apocalyptic number.

It is an amenable number.

3985845 is a deficient number, since it is larger than the sum of its proper divisors (2416395).

3985845 is a wasteful number, since it uses less digits than its factorization.

3985845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1044.

The product of its digits is 172800, while the sum is 42.

The square root of 3985845 is about 1996.4581137605. The cubic root of 3985845 is about 158.5526367055.

It can be divided in two parts, 39858 and 45, that added together give a triangular number (39903 = T₂₈₂).

The spelling of 3985845 in words is "three million, nine hundred eighty-five thousand, eight hundred forty-five".