3865811995 has 4 divisors (see below), whose sum is σ = 4638974400. Its totient is φ = 3092649592.

The previous prime is 3865811959. The next prime is 3865812007. The reversal of 3865811995 is 5991185683.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5991185683 = 7 ⋅855883669.

It is a cyclic number.

It is not a de Polignac number, because 3865811995 - 2¹⁵ = 3865779227 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 386581195 + ... + 386581204.

It is an arithmetic number, because the mean of its divisors is an integer number (1159743600).

Almost surely, 2^3865811995 is an apocalyptic number.

3865811995 is a deficient number, since it is larger than the sum of its proper divisors (773162405).

3865811995 is an equidigital number, since it uses as much as digits as its factorization.

3865811995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773162404.

The product of its digits is 2332800, while the sum is 55.

The square root of 3865811995 is about 62175.6543592426. The cubic root of 3865811995 is about 1569.4479234606.

It can be divided in two parts, 38658 and 11995, that added together give a cube (50653 = 37³).

The spelling of 3865811995 in words is "three billion, eight hundred sixty-five million, eight hundred eleven thousand, nine hundred ninety-five".