3865186538 has 16 divisors (see below), whose sum is σ = 6141319560. Its totient is φ = 1818172416.

The previous prime is 3865186531. The next prime is 3865186621. The reversal of 3865186538 is 8356815683.

It can be written as a sum of positive squares in 4 ways, for example, as 2596615849 + 1268570689 = 50957^2 + 35617^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 3865186538.

It is not an unprimeable number, because it can be changed into a prime (3865186531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66920 + ... + 110492.

Almost surely, 2^3865186538 is an apocalyptic number.

3865186538 is a deficient number, since it is larger than the sum of its proper divisors (2276133022).

3865186538 is a wasteful number, since it uses less digits than its factorization.

3865186538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46201.

The product of its digits is 4147200, while the sum is 53.

The square root of 3865186538 is about 62170.6243977009. The cubic root of 3865186538 is about 1569.3632775841.

The spelling of 3865186538 in words is "three billion, eight hundred sixty-five million, one hundred eighty-six thousand, five hundred thirty-eight".