213789 has 4 divisors (see below), whose sum is σ = 285056. Its totient is φ = 142524.

The previous prime is 213751. The next prime is 213791. The reversal of 213789 is 987312.

It is a happy number.

213789 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 213789 - 2⁸ = 213533 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213799) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35629 + ... + 35634.

It is an arithmetic number, because the mean of its divisors is an integer number (71264).

2²¹³⁷⁸⁹ is an apocalyptic number.

It is an amenable number.

213789 is a deficient number, since it is larger than the sum of its proper divisors (71267).

213789 is an equidigital number, since it uses as much as digits as its factorization.

213789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71266.

The product of its digits is 3024, while the sum is 30.

The square root of 213789 is about 462.3732258685. The cubic root of 213789 is about 59.7945752584.

The spelling of 213789 in words is "two hundred thirteen thousand, seven hundred eighty-nine".