3868121187 has 12 divisors (see below), whose sum is σ = 6385470000. Its totient is φ = 2210354928.

The previous prime is 3868121171. The next prime is 3868121189. The reversal of 3868121187 is 7811218683.

It is a happy number.

It is not a de Polignac number, because 3868121187 - 2⁴ = 3868121171 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3868121189) 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, 30699312 + ... + 30699437.

It is an arithmetic number, because the mean of its divisors is an integer number (532122500).

Almost surely, 2^3868121187 is an apocalyptic number.

3868121187 is a deficient number, since it is larger than the sum of its proper divisors (2517348813).

3868121187 is a wasteful number, since it uses less digits than its factorization.

3868121187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61398762 (or 61398759 counting only the distinct ones).

The product of its digits is 129024, while the sum is 45.

The square root of 3868121187 is about 62194.2214920325. The cubic root of 3868121187 is about 1569.7603576245.

The spelling of 3868121187 in words is "three billion, eight hundred sixty-eight million, one hundred twenty-one thousand, one hundred eighty-seven".