213879 has 4 divisors (see below), whose sum is σ = 285176. Its totient is φ = 142584.

The previous prime is 213859. The next prime is 213881. The reversal of 213879 is 978312.

It is a happy number.

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

It is not a de Polignac number, because 213879 - 2⁵ = 213847 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 213879.

It is not an unprimeable number, because it can be changed into a prime (213859) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 35644 + ... + 35649.

It is an arithmetic number, because the mean of its divisors is an integer number (71294).

2²¹³⁸⁷⁹ is an apocalyptic number.

213879 is a deficient number, since it is larger than the sum of its proper divisors (71297).

213879 is an equidigital number, since it uses as much as digits as its factorization.

213879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71296.

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

The square root of 213879 is about 462.4705396023. The cubic root of 213879 is about 59.8029647714.

The spelling of 213879 in words is "two hundred thirteen thousand, eight hundred seventy-nine".