3985531 has 8 divisors (see below), whose sum is σ = 4603824. Its totient is φ = 3409920.

The previous prime is 3985523. The next prime is 3985537. The reversal of 3985531 is 1355893.

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 3985531 - 2³ = 3985523 is a prime.

It is a super-2 number, since 2×3985531² = 31768914703922, which contains 22 as substring.

It is a Duffinian number.

3985531 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3985537) 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 7 ways as a sum of consecutive naturals, for example, 10470 + ... + 10843.

It is an arithmetic number, because the mean of its divisors is an integer number (575478).

Almost surely, 2^3985531 is an apocalyptic number.

3985531 is a deficient number, since it is larger than the sum of its proper divisors (618293).

3985531 is a wasteful number, since it uses less digits than its factorization.

3985531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21341.

The product of its digits is 16200, while the sum is 34.

The square root of 3985531 is about 1996.3794729460. The cubic root of 3985531 is about 158.5484730685.

It can be divided in two parts, 398 and 5531, that added together give a square (5929 = 77²).

The spelling of 3985531 in words is "three million, nine hundred eighty-five thousand, five hundred thirty-one".