3861543939 has 16 divisors (see below), whose sum is σ = 5708872704. Its totient is φ = 2301962400.

The previous prime is 3861543929. The next prime is 3861543941. The reversal of 3861543939 is 9393451683.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-3861543939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3861543891 and 3861543900.

It is not an unprimeable number, because it can be changed into a prime (3861543929) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 957139 + ... + 961164.

It is an arithmetic number, because the mean of its divisors is an integer number (356804544).

Almost surely, 2^3861543939 is an apocalyptic number.

3861543939 is a deficient number, since it is larger than the sum of its proper divisors (1847328765).

3861543939 is a wasteful number, since it uses less digits than its factorization.

3861543939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1918378.

The product of its digits is 2099520, while the sum is 51.

The square root of 3861543939 is about 62141.3223145436. The cubic root of 3861543939 is about 1568.8701269280.

It can be divided in two parts, 386154 and 3939, that added together give a palindrome (390093).

The spelling of 3861543939 in words is "three billion, eight hundred sixty-one million, five hundred forty-three thousand, nine hundred thirty-nine".