211389 has 8 divisors (see below), whose sum is σ = 291072. Its totient is φ = 136320.

The previous prime is 211373. The next prime is 211403. The reversal of 211389 is 983112.

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

It is not a de Polignac number, because 211389 - 2⁴ = 211373 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1044 + ... + 1229.

It is an arithmetic number, because the mean of its divisors is an integer number (36384).

2²¹¹³⁸⁹ is an apocalyptic number.

It is an amenable number.

211389 is a deficient number, since it is larger than the sum of its proper divisors (79683).

211389 is a wasteful number, since it uses less digits than its factorization.

211389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2307.

The product of its digits is 432, while the sum is 24.

The square root of 211389 is about 459.7705949710. The cubic root of 211389 is about 59.5699809790.

The spelling of 211389 in words is "two hundred eleven thousand, three hundred eighty-nine".