213889 has 4 divisors (see below), whose sum is σ = 230356. Its totient is φ = 197424.

The previous prime is 213887. The next prime is 213901. The reversal of 213889 is 988312.

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

It can be written as a sum of positive squares in 2 ways, for example, as 119025 + 94864 = 345^2 + 308^2 .

It is a cyclic number.

It is not a de Polignac number, because 213889 - 2¹ = 213887 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 213889.

It is not an unprimeable number, because it can be changed into a prime (213881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8214 + ... + 8239.

It is an arithmetic number, because the mean of its divisors is an integer number (57589).

2²¹³⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

213889 is a deficient number, since it is larger than the sum of its proper divisors (16467).

213889 is a wasteful number, since it uses less digits than its factorization.

213889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16466.

The product of its digits is 3456, while the sum is 31.

The square root of 213889 is about 462.4813509754. The cubic root of 213889 is about 59.8038967942.

The spelling of 213889 in words is "two hundred thirteen thousand, eight hundred eighty-nine".