2188338647 has 4 divisors (see below), whose sum is σ = 2387278536. Its totient is φ = 1989398760.

The previous prime is 2188338629. The next prime is 2188338697. The reversal of 2188338647 is 7468338812.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2188338647 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2188338595 and 2188338604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2188338697) 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, 99469928 + ... + 99469949.

It is an arithmetic number, because the mean of its divisors is an integer number (596819634).

Almost surely, 2^2188338647 is an apocalyptic number.

2188338647 is a deficient number, since it is larger than the sum of its proper divisors (198939889).

2188338647 is a wasteful number, since it uses less digits than its factorization.

2188338647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198939888.

The product of its digits is 1548288, while the sum is 50.

The square root of 2188338647 is about 46779.6819890858. The cubic root of 2188338647 is about 1298.2893964426.

The spelling of 2188338647 in words is "two billion, one hundred eighty-eight million, three hundred thirty-eight thousand, six hundred forty-seven".