3985851 has 4 divisors (see below), whose sum is σ = 5314472. Its totient is φ = 2657232.

The previous prime is 3985843. The next prime is 3985853. The reversal of 3985851 is 1585893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1585893 = 3 ⋅528631.

It is not a de Polignac number, because 3985851 - 2³ = 3985843 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3985853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 664306 + ... + 664311.

It is an arithmetic number, because the mean of its divisors is an integer number (1328618).

Almost surely, 2^3985851 is an apocalyptic number.

3985851 is a deficient number, since it is larger than the sum of its proper divisors (1328621).

3985851 is a wasteful number, since it uses less digits than its factorization.

3985851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1328620.

The product of its digits is 43200, while the sum is 39.

The square root of 3985851 is about 1996.4596164210. The cubic root of 3985851 is about 158.5527162633.

The spelling of 3985851 in words is "three million, nine hundred eighty-five thousand, eight hundred fifty-one".