2138986784 has 96 divisors (see below), whose sum is σ = 4898880000. Its totient is φ = 908554240.

The previous prime is 2138986783. The next prime is 2138986789. The reversal of 2138986784 is 4876898312.

It is not an unprimeable number, because it can be changed into a prime (2138986783) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 890417 + ... + 892815.

It is an arithmetic number, because the mean of its divisors is an integer number (51030000).

Almost surely, 2^2138986784 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2138986784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2449440000).

2138986784 is an abundant number, since it is smaller than the sum of its proper divisors (2759893216).

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

2138986784 is a wasteful number, since it uses less digits than its factorization.

2138986784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2586 (or 2578 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 56.

The square root of 2138986784 is about 46249.1814414050. The cubic root of 2138986784 is about 1288.4553319849.

The spelling of 2138986784 in words is "two billion, one hundred thirty-eight million, nine hundred eighty-six thousand, seven hundred eighty-four".