2138648377 has 4 divisors (see below), whose sum is σ = 2155488256. Its totient is φ = 2121808500.

The previous prime is 2138648371. The next prime is 2138648381. The reversal of 2138648377 is 7738468312.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2138648377 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2138648377.

It is not an unprimeable number, because it can be changed into a prime (2138648371) 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, 8419749 + ... + 8420002.

It is an arithmetic number, because the mean of its divisors is an integer number (538872064).

Almost surely, 2^2138648377 is an apocalyptic number.

It is an amenable number.

2138648377 is a deficient number, since it is larger than the sum of its proper divisors (16839879).

2138648377 is a wasteful number, since it uses less digits than its factorization.

2138648377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16839878.

The product of its digits is 1354752, while the sum is 49.

The square root of 2138648377 is about 46245.5227778863. The cubic root of 2138648377 is about 1288.3873799834.

The spelling of 2138648377 in words is "two billion, one hundred thirty-eight million, six hundred forty-eight thousand, three hundred seventy-seven".