2005818839 has 2 divisors, whose sum is σ = 2005818840. Its totient is φ = 2005818838.

The previous prime is 2005818821. The next prime is 2005818863. The reversal of 2005818839 is 9388185002.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2005818839 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2005818839.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2005818889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1002909419 + 1002909420.

It is an arithmetic number, because the mean of its divisors is an integer number (1002909420).

Almost surely, 2^2005818839 is an apocalyptic number.

2005818839 is a deficient number, since it is larger than the sum of its proper divisors (1).

2005818839 is an equidigital number, since it uses as much as digits as its factorization.

2005818839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 138240, while the sum is 44.

The square root of 2005818839 is about 44786.3688972437. The cubic root of 2005818839 is about 1261.1417464434.

The spelling of 2005818839 in words is "two billion, five million, eight hundred eighteen thousand, eight hundred thirty-nine".