2191798 has 16 divisors (see below), whose sum is σ = 3838464. Its totient is φ = 919080.

The previous prime is 2191727. The next prime is 2191799. The reversal of 2191798 is 8971912.

2191798 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191799) 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 7 ways as a sum of consecutive naturals, for example, 1008 + ... + 2323.

It is an arithmetic number, because the mean of its divisors is an integer number (239904).

2^2191798 is an apocalyptic number.

2191798 is a deficient number, since it is larger than the sum of its proper divisors (1646666).

2191798 is a wasteful number, since it uses less digits than its factorization.

2191798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3387.

The product of its digits is 9072, while the sum is 37.

The square root of 2191798 is about 1480.4722219616. The cubic root of 2191798 is about 129.8973153623.

It can be divided in two parts, 21 and 91798, that added together give a palindrome (91819).

The spelling of 2191798 in words is "two million, one hundred ninety-one thousand, seven hundred ninety-eight".