2188739878 has 16 divisors (see below), whose sum is σ = 3562652016. Its totient is φ = 1002474720.

The previous prime is 2188739857. The next prime is 2188739879. The reversal of 2188739878 is 8789378812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2188739879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 317901 + ... + 324712.

It is an arithmetic number, because the mean of its divisors is an integer number (222665751).

Almost surely, 2^2188739878 is an apocalyptic number.

2188739878 is a deficient number, since it is larger than the sum of its proper divisors (1373912138).

2188739878 is a wasteful number, since it uses less digits than its factorization.

2188739878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642759.

The product of its digits is 10838016, while the sum is 61.

The square root of 2188739878 is about 46783.9703103531. The cubic root of 2188739878 is about 1298.3687385377.

The spelling of 2188739878 in words is "two billion, one hundred eighty-eight million, seven hundred thirty-nine thousand, eight hundred seventy-eight".