3865123385 has 4 divisors (see below), whose sum is σ = 4638148068. Its totient is φ = 3092098704.

The previous prime is 3865123373. The next prime is 3865123387. The reversal of 3865123385 is 5833215683.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1647466921 + 2217656464 = 40589^2 + 47092^2 .

It is a cyclic number.

It is not a de Polignac number, because 3865123385 - 2⁶ = 3865123321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3865123387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 386512334 + ... + 386512343.

It is an arithmetic number, because the mean of its divisors is an integer number (1159537017).

Almost surely, 2^3865123385 is an apocalyptic number.

It is an amenable number.

3865123385 is a deficient number, since it is larger than the sum of its proper divisors (773024683).

3865123385 is an equidigital number, since it uses as much as digits as its factorization.

3865123385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 773024682.

The product of its digits is 518400, while the sum is 44.

The square root of 3865123385 is about 62170.1164949850. The cubic root of 3865123385 is about 1569.3547303003.

The spelling of 3865123385 in words is "three billion, eight hundred sixty-five million, one hundred twenty-three thousand, three hundred eighty-five".