2105907839 has 8 divisors (see below), whose sum is σ = 2455869600. Its totient is φ = 1805063568.

The previous prime is 2105907833. The next prime is 2105907847. The reversal of 2105907839 is 9387095012.

It is a de Polignac number, because none of the positive numbers 2^k-2105907839 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2105907839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2105907833) 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, 3069494 + ... + 3070179.

It is an arithmetic number, because the mean of its divisors is an integer number (306983700).

Almost surely, 2^2105907839 is an apocalyptic number.

2105907839 is a deficient number, since it is larger than the sum of its proper divisors (349961761).

2105907839 is an frugal number, since it uses more digits than its factorization.

2105907839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6139694 (or 6139680 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 44.

The square root of 2105907839 is about 45890.1714858422. The cubic root of 2105907839 is about 1281.7789065872.

The spelling of 2105907839 in words is "two billion, one hundred five million, nine hundred seven thousand, eight hundred thirty-nine".