2138127644 has 6 divisors (see below), whose sum is σ = 3741723384. Its totient is φ = 1069063820.

The previous prime is 2138127637. The next prime is 2138127647. The reversal of 2138127644 is 4467218312.

It is a junction number, because it is equal to n+sod(n) for n = 2138127598 and 2138127607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2138127647) 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, 267265952 + ... + 267265959.

It is an arithmetic number, because the mean of its divisors is an integer number (623620564).

Almost surely, 2^2138127644 is an apocalyptic number.

It is an amenable number.

2138127644 is a deficient number, since it is larger than the sum of its proper divisors (1603595740).

2138127644 is a wasteful number, since it uses less digits than its factorization.

2138127644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534531915 (or 534531913 counting only the distinct ones).

The product of its digits is 64512, while the sum is 38.

The square root of 2138127644 is about 46239.8923441653. The cubic root of 2138127644 is about 1288.2828029848.

The spelling of 2138127644 in words is "two billion, one hundred thirty-eight million, one hundred twenty-seven thousand, six hundred forty-four".