211806382 has 4 divisors (see below), whose sum is σ = 317709576. Its totient is φ = 105903190.

The previous prime is 211806377. The next prime is 211806407. The reversal of 211806382 is 283608112.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52951594 + ... + 52951597.

It is an arithmetic number, because the mean of its divisors is an integer number (79427394).

Almost surely, 2^211806382 is an apocalyptic number.

211806382 is a deficient number, since it is larger than the sum of its proper divisors (105903194).

211806382 is a wasteful number, since it uses less digits than its factorization.

211806382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105903193.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 211806382 is about 14553.5693903592. The cubic root of 211806382 is about 596.0916165483.

The spelling of 211806382 in words is "two hundred eleven million, eight hundred six thousand, three hundred eighty-two".