2138743879 has 2 divisors, whose sum is σ = 2138743880. Its totient is φ = 2138743878.

The previous prime is 2138743829. The next prime is 2138743889. The reversal of 2138743879 is 9783478312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2138743879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2138743829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069371939 + 1069371940.

It is an arithmetic number, because the mean of its divisors is an integer number (1069371940).

Almost surely, 2^2138743879 is an apocalyptic number.

2138743879 is a deficient number, since it is larger than the sum of its proper divisors (1).

2138743879 is an equidigital number, since it uses as much as digits as its factorization.

2138743879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2032128, while the sum is 52.

The square root of 2138743879 is about 46246.5553203695. Note that the first 3 decimals coincide. The cubic root of 2138743879 is about 1288.4065574760.

The spelling of 2138743879 in words is "two billion, one hundred thirty-eight million, seven hundred forty-three thousand, eight hundred seventy-nine".