211828 has 6 divisors (see below), whose sum is σ = 370706. Its totient is φ = 105912.

The previous prime is 211817. The next prime is 211859. The reversal of 211828 is 828112.

It can be written as a sum of positive squares in only one way, i.e., 116964 + 94864 = 342^2 + 308^2 .

It is a super-2 number, since 2×211828² = 89742203168, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211799 and 211808.

It is a congruent number.

It is an unprimeable 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, 26475 + ... + 26482.

2²¹¹⁸²⁸ is an apocalyptic number.

It is an amenable number.

211828 is a deficient number, since it is larger than the sum of its proper divisors (158878).

211828 is a wasteful number, since it uses less digits than its factorization.

211828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52961 (or 52959 counting only the distinct ones).

The product of its digits is 256, while the sum is 22.

The square root of 211828 is about 460.2477593645. The cubic root of 211828 is about 59.6111895871.

It can be divided in two parts, 21 and 1828, that added together give a square (1849 = 43²).

The spelling of 211828 in words is "two hundred eleven thousand, eight hundred twenty-eight".