2188538705 has 4 divisors (see below), whose sum is σ = 2626246452. Its totient is φ = 1750830960.

The previous prime is 2188538701. The next prime is 2188538753. The reversal of 2188538705 is 5078358812.

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

It can be written as a sum of positive squares in 2 ways, for example, as 315986176 + 1872552529 = 17776^2 + 43273^2 .

It is not a de Polignac number, because 2188538705 - 2² = 2188538701 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 2188538705.

It is not an unprimeable number, because it can be changed into a prime (2188538701) 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, 218853866 + ... + 218853875.

It is an arithmetic number, because the mean of its divisors is an integer number (656561613).

Almost surely, 2^2188538705 is an apocalyptic number.

It is an amenable number.

2188538705 is a deficient number, since it is larger than the sum of its proper divisors (437707747).

2188538705 is an equidigital number, since it uses as much as digits as its factorization.

2188538705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437707746.

The product of its (nonzero) digits is 537600, while the sum is 47.

The square root of 2188538705 is about 46781.8202403455. The cubic root of 2188538705 is about 1298.3289584585.

The spelling of 2188538705 in words is "two billion, one hundred eighty-eight million, five hundred thirty-eight thousand, seven hundred five".