3865665100 has 36 divisors (see below), whose sum is σ = 9151086168. Its totient is φ = 1405696000.

The previous prime is 3865665091. The next prime is 3865665103. The reversal of 3865665100 is 15665683.

It is a super-3 number, since 3×3865665100³ (a number of 30 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (3865665103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1756021 + ... + 1758220.

It is an arithmetic number, because the mean of its divisors is an integer number (254196838).

Almost surely, 2^3865665100 is an apocalyptic number.

It is an amenable number.

3865665100 is an abundant number, since it is smaller than the sum of its proper divisors (5285421068).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3865665100 is a wasteful number, since it uses less digits than its factorization.

3865665100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3514266 (or 3514259 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 40.

The square root of 3865665100 is about 62174.4730576786. The cubic root of 3865665100 is about 1569.4280443276.

The spelling of 3865665100 in words is "three billion, eight hundred sixty-five million, six hundred sixty-five thousand, one hundred".