2138928816 has 40 divisors (see below), whose sum is σ = 5549310000. Its totient is φ = 709912576.

The previous prime is 2138928809. The next prime is 2138928839. The reversal of 2138928816 is 6188298312.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84441 + ... + 106808.

It is an arithmetic number, because the mean of its divisors is an integer number (138732750).

Almost surely, 2^2138928816 is an apocalyptic number.

It is an amenable number.

2138928816 is an abundant number, since it is smaller than the sum of its proper divisors (3410381184).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2138928816 is a wasteful number, since it uses less digits than its factorization.

2138928816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191493 (or 191487 counting only the distinct ones).

The product of its digits is 331776, while the sum is 48.

The square root of 2138928816 is about 46248.5547449864. The cubic root of 2138928816 is about 1288.4436925405.

It can be divided in two parts, 21389 and 28816, that added together give a palindrome (50205).

The spelling of 2138928816 in words is "two billion, one hundred thirty-eight million, nine hundred twenty-eight thousand, eight hundred sixteen".