2138748769 has 4 divisors (see below), whose sum is σ = 2140079620. Its totient is φ = 2137417920.

The previous prime is 2138748757. The next prime is 2138748779. The reversal of 2138748769 is 9678478312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1568160000 + 570588769 = 39600^2 + 23887^2 .

It is a cyclic number.

It is not a de Polignac number, because 2138748769 - 2¹¹ = 2138746721 is a prime.

It is a super-2 number, since 2×2138748769² = 9148492593798030722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2138748709) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 663012 + ... + 666229.

It is an arithmetic number, because the mean of its divisors is an integer number (535019905).

Almost surely, 2^2138748769 is an apocalyptic number.

It is an amenable number.

2138748769 is a deficient number, since it is larger than the sum of its proper divisors (1330851).

2138748769 is a wasteful number, since it uses less digits than its factorization.

2138748769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1330850.

The product of its digits is 4064256, while the sum is 55.

The square root of 2138748769 is about 46246.6081891418. The cubic root of 2138748769 is about 1288.4075394080.

The spelling of 2138748769 in words is "two billion, one hundred thirty-eight million, seven hundred forty-eight thousand, seven hundred sixty-nine".