3985665893 has 16 divisors (see below), whose sum is σ = 4456166400. Its totient is φ = 3534301680.

The previous prime is 3985665889. The next prime is 3985665911.

3985665893 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 3985665893 - 2² = 3985665889 is a prime.

It is a super-2 number, since 2×3985665893² = 31771065221246974898, 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 (3985665823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44498 + ... + 99756.

It is an arithmetic number, because the mean of its divisors is an integer number (278510400).

Almost surely, 2^3985665893 is an apocalyptic number.

It is an amenable number.

3985665893 is a deficient number, since it is larger than the sum of its proper divisors (470500507).

3985665893 is a wasteful number, since it uses less digits than its factorization.

3985665893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55432.

The product of its digits is 41990400, while the sum is 62.

The square root of 3985665893 is about 63132.1304329261. The cubic root of 3985665893 is about 1585.5026177516.

The spelling of 3985665893 in words is "three billion, nine hundred eighty-five million, six hundred sixty-five thousand, eight hundred ninety-three".