211798 has 4 divisors (see below), whose sum is σ = 317700. Its totient is φ = 105898.

The previous prime is 211789. The next prime is 211801. The reversal of 211798 is 897112.

It is a semiprime because it is the product of two primes.

It is a nialpdrome in base 13.

It is a congruent number.

It is an unprimeable number.

211798 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 as a sum of consecutive naturals, namely, 52948 + ... + 52951.

It is an arithmetic number, because the mean of its divisors is an integer number (79425).

2²¹¹⁷⁹⁸ is an apocalyptic number.

211798 is a deficient number, since it is larger than the sum of its proper divisors (105902).

211798 is a wasteful number, since it uses less digits than its factorization.

211798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105901.

The product of its digits is 1008, while the sum is 28.

The square root of 211798 is about 460.2151670686. The cubic root of 211798 is about 59.6083753226.

The spelling of 211798 in words is "two hundred eleven thousand, seven hundred ninety-eight".