2217798 has 48 divisors (see below), whose sum is σ = 5481216. Its totient is φ = 641520.

The previous prime is 2217779. The next prime is 2217799. The reversal of 2217798 is 8977122.

2217798 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a d-powerful number, because it can be written as 2 + 2²¹ + 1 + 7⁴ + 7⁶ + 9² + 8³ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2217799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4311 + ... + 4797.

It is an arithmetic number, because the mean of its divisors is an integer number (114192).

2^2217798 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2217798, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2740608).

2217798 is an abundant number, since it is smaller than the sum of its proper divisors (3263418).

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

2217798 is a wasteful number, since it uses less digits than its factorization.

2217798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529 (or 526 counting only the distinct ones).

The product of its digits is 14112, while the sum is 36.

The square root of 2217798 is about 1489.2273164296. The cubic root of 2217798 is about 130.4089292818.

The spelling of 2217798 in words is "two million, two hundred seventeen thousand, seven hundred ninety-eight".