2217817994 has 64 divisors (see below), whose sum is σ = 4092664320. Its totient is φ = 879820800.

The previous prime is 2217817993. The next prime is 2217818023. The reversal of 2217817994 is 4997187122.

It is a Smith number, since the sum of its digits (50) 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 (2217817993) 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 31 ways as a sum of consecutive naturals, for example, 6177587 + ... + 6177945.

It is an arithmetic number, because the mean of its divisors is an integer number (63947880).

Almost surely, 2^2217817994 is an apocalyptic number.

2217817994 is a deficient number, since it is larger than the sum of its proper divisors (1874846326).

2217817994 is a wasteful number, since it uses less digits than its factorization.

2217817994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743.

The product of its digits is 508032, while the sum is 50.

The square root of 2217817994 is about 47093.7150159127. The cubic root of 2217817994 is about 1304.0932117023.

The spelling of 2217817994 in words is "two billion, two hundred seventeen million, eight hundred seventeen thousand, nine hundred ninety-four".