2178934818 has 16 divisors (see below), whose sum is σ = 4360940640. Its totient is φ = 725799776.

The previous prime is 2178934811. The next prime is 2178934819. The reversal of 2178934818 is 8184398712.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (2178934811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118683 + ... + 135806.

It is an arithmetic number, because the mean of its divisors is an integer number (272558790).

Almost surely, 2^2178934818 is an apocalyptic number.

2178934818 is an abundant number, since it is smaller than the sum of its proper divisors (2182005822).

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

2178934818 is a wasteful number, since it uses less digits than its factorization.

2178934818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255921.

The product of its digits is 774144, while the sum is 51.

The square root of 2178934818 is about 46679.0618800335. The cubic root of 2178934818 is about 1296.4270366769.

The spelling of 2178934818 in words is "two billion, one hundred seventy-eight million, nine hundred thirty-four thousand, eight hundred eighteen".