2138138769 has 8 divisors (see below), whose sum is σ = 3070148032. Its totient is φ = 1315777680.

The previous prime is 2138138747. The next prime is 2138138803. The reversal of 2138138769 is 9678318312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2138138769 - 2⁷ = 2138138641 is a prime.

It is a super-2 number, since 2×2138138769² = 9143274791001670722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2138138729) 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 7 ways as a sum of consecutive naturals, for example, 27411997 + ... + 27412074.

It is an arithmetic number, because the mean of its divisors is an integer number (383768504).

Almost surely, 2^2138138769 is an apocalyptic number.

It is an amenable number.

2138138769 is a deficient number, since it is larger than the sum of its proper divisors (932009263).

2138138769 is a wasteful number, since it uses less digits than its factorization.

2138138769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54824087.

The product of its digits is 435456, while the sum is 48.

The square root of 2138138769 is about 46240.0126405692. The cubic root of 2138138769 is about 1288.2850373573.

The spelling of 2138138769 in words is "two billion, one hundred thirty-eight million, one hundred thirty-eight thousand, seven hundred sixty-nine".