211838 has 8 divisors (see below), whose sum is σ = 346680. Its totient is φ = 96280.

The previous prime is 211817. The next prime is 211859. The reversal of 211838 is 838112.

211838 is an esthetic number in base 5, because in such base its adjacent digits differ by 1.

It is an interprime number because it is at equal distance from previous prime (211817) and next prime (211859).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 4793 + ... + 4836.

It is an arithmetic number, because the mean of its divisors is an integer number (43335).

2²¹¹⁸³⁸ is an apocalyptic number.

211838 is a deficient number, since it is larger than the sum of its proper divisors (134842).

211838 is a wasteful number, since it uses less digits than its factorization.

211838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9642.

The product of its digits is 384, while the sum is 23.

The square root of 211838 is about 460.2586229502. The cubic root of 211838 is about 59.6121276163.

The spelling of 211838 in words is "two hundred eleven thousand, eight hundred thirty-eight".