2138608785 has 16 divisors (see below), whose sum is σ = 3422399040. Its totient is φ = 1140383040.

The previous prime is 2138608781. The next prime is 2138608807. The reversal of 2138608785 is 5878068312.

It is not a de Polignac number, because 2138608785 - 2² = 2138608781 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2138608781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108330 + ... + 126540.

It is an arithmetic number, because the mean of its divisors is an integer number (213899940).

Almost surely, 2^2138608785 is an apocalyptic number.

It is an amenable number.

2138608785 is a deficient number, since it is larger than the sum of its proper divisors (1283790255).

2138608785 is a wasteful number, since it uses less digits than its factorization.

2138608785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26048.

The product of its (nonzero) digits is 645120, while the sum is 48.

The square root of 2138608785 is about 46245.0947128450. The cubic root of 2138608785 is about 1288.3794294559.

The spelling of 2138608785 in words is "two billion, one hundred thirty-eight million, six hundred eight thousand, seven hundred eighty-five".