2218281786 has 48 divisors (see below), whose sum is σ = 5547305088. Its totient is φ = 627516000.

The previous prime is 2218281773. The next prime is 2218281799. The reversal of 2218281786 is 6871828122.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2218281773) and next prime (2218281799).

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 74430 + ... + 99881.

It is an arithmetic number, because the mean of its divisors is an integer number (115568856).

Almost surely, 2^2218281786 is an apocalyptic number.

2218281786 is an abundant number, since it is smaller than the sum of its proper divisors (3329023302).

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

2218281786 is a wasteful number, since it uses less digits than its factorization.

2218281786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174427 (or 174424 counting only the distinct ones).

The product of its digits is 172032, while the sum is 45.

The square root of 2218281786 is about 47098.6388975308. The cubic root of 2218281786 is about 1304.1841097298.

The spelling of 2218281786 in words is "two billion, two hundred eighteen million, two hundred eighty-one thousand, seven hundred eighty-six".