3939387861 has 8 divisors (see below), whose sum is σ = 5364273024. Its totient is φ = 2570380640.

The previous prime is 3939387839. The next prime is 3939387889. The reversal of 3939387861 is 1687839393.

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 3939387861 - 2⁷ = 3939387733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3939387821) 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, 13969320 + ... + 13969601.

It is an arithmetic number, because the mean of its divisors is an integer number (670534128).

Almost surely, 2^3939387861 is an apocalyptic number.

It is an amenable number.

3939387861 is a deficient number, since it is larger than the sum of its proper divisors (1424885163).

3939387861 is a wasteful number, since it uses less digits than its factorization.

3939387861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27938971.

The product of its digits is 5878656, while the sum is 57.

The square root of 3939387861 is about 62764.5430239080. The cubic root of 3939387861 is about 1579.3422275349.

The spelling of 3939387861 in words is "three billion, nine hundred thirty-nine million, three hundred eighty-seven thousand, eight hundred sixty-one".