3866121885 has 8 divisors (see below), whose sum is σ = 6185795040. Its totient is φ = 2061931664.

The previous prime is 3866121877. The next prime is 3866121899. The reversal of 3866121885 is 5881216683.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3866121885 - 2³ = 3866121877 is a prime.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 128870715 + ... + 128870744.

It is an arithmetic number, because the mean of its divisors is an integer number (773224380).

Almost surely, 2^3866121885 is an apocalyptic number.

It is an amenable number.

3866121885 is a deficient number, since it is larger than the sum of its proper divisors (2319673155).

3866121885 is a wasteful number, since it uses less digits than its factorization.

3866121885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257741467.

The product of its digits is 552960, while the sum is 48.

The square root of 3866121885 is about 62178.1463618851. The cubic root of 3866121885 is about 1569.4898588697.

It can be divided in two parts, 3866 and 121885, that added together give a triangular number (125751 = T₅₀₁).

The spelling of 3866121885 in words is "three billion, eight hundred sixty-six million, one hundred twenty-one thousand, eight hundred eighty-five".