3985856281 has 12 divisors (see below), whose sum is σ = 4403413476. Its totient is φ = 3605090720.

The previous prime is 3985856269. The next prime is 3985856293. The reversal of 3985856281 is 1826585893.

It is an interprime number because it is at equal distance from previous prime (3985856269) and next prime (3985856293).

It can be written as a sum of positive squares in 2 ways, for example, as 3607203600 + 378652681 = 60060^2 + 19459^2 .

It is not a de Polignac number, because 3985856281 - 2¹⁹ = 3985331993 is a prime.

It is a super-2 number, since 2×3985856281² = 31774100585574301922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3985856221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59770 + ... + 107443.

It is an arithmetic number, because the mean of its divisors is an integer number (366951123).

Almost surely, 2^3985856281 is an apocalyptic number.

It is an amenable number.

3985856281 is a deficient number, since it is larger than the sum of its proper divisors (417557195).

3985856281 is a wasteful number, since it uses less digits than its factorization.

3985856281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167432 (or 167421 counting only the distinct ones).

The product of its digits is 4147200, while the sum is 55.

The square root of 3985856281 is about 63133.6382683590. The cubic root of 3985856281 is about 1585.5278628737.

The spelling of 3985856281 in words is "three billion, nine hundred eighty-five million, eight hundred fifty-six thousand, two hundred eighty-one".