2138427865 has 24 divisors (see below), whose sum is σ = 3142186560. Its totient is φ = 1389171168.

The previous prime is 2138427859. The next prime is 2138427869. The reversal of 2138427865 is 5687248312.

It is not a de Polignac number, because 2138427865 - 2¹⁷ = 2138296793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2138427869) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 225037 + ... + 234346.

It is an arithmetic number, because the mean of its divisors is an integer number (130924440).

Almost surely, 2^2138427865 is an apocalyptic number.

It is an amenable number.

2138427865 is a deficient number, since it is larger than the sum of its proper divisors (1003758695).

2138427865 is a wasteful number, since it uses less digits than its factorization.

2138427865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459421 (or 459414 counting only the distinct ones).

The product of its digits is 645120, while the sum is 46.

The square root of 2138427865 is about 46243.1385721168. The cubic root of 2138427865 is about 1288.3430973972.

The spelling of 2138427865 in words is "two billion, one hundred thirty-eight million, four hundred twenty-seven thousand, eight hundred sixty-five".