3985861 has 6 divisors (see below), whose sum is σ = 4381286. Its totient is φ = 3623400.

The previous prime is 3985859. The next prime is 3985867. The reversal of 3985861 is 1685893.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 3876961 + 108900 = 1969^2 + 330^2 .

It is not a de Polignac number, because 3985861 - 2¹ = 3985859 is a prime.

It is a super-2 number, since 2×3985861² = 31774175822642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3985867) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16350 + ... + 16591.

Almost surely, 2^3985861 is an apocalyptic number.

It is an amenable number.

3985861 is a deficient number, since it is larger than the sum of its proper divisors (395425).

3985861 is a wasteful number, since it uses less digits than its factorization.

3985861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32963 (or 32952 counting only the distinct ones).

The product of its digits is 51840, while the sum is 40.

The square root of 3985861 is about 1996.4621208528. The cubic root of 3985861 is about 158.5528488595.

Subtracting from 3985861 its reverse (1685893), we obtain a cube (2299968 = 132³).

The spelling of 3985861 in words is "three million, nine hundred eighty-five thousand, eight hundred sixty-one".