219985 has 4 divisors (see below), whose sum is σ = 263988. Its totient is φ = 175984.

The previous prime is 219983. The next prime is 220009. The reversal of 219985 is 589912.

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 65536 + 154449 = 256^2 + 393^2 .

It is a cyclic number.

It is not a de Polignac number, because 219985 - 2¹ = 219983 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 8.

It is a self number, because there is not a number n which added to its sum of digits gives 219985.

It is not an unprimeable number, because it can be changed into a prime (219983) 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, 21994 + ... + 22003.

It is an arithmetic number, because the mean of its divisors is an integer number (65997).

2²¹⁹⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

219985 is a deficient number, since it is larger than the sum of its proper divisors (44003).

219985 is an equidigital number, since it uses as much as digits as its factorization.

219985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44002.

The product of its digits is 6480, while the sum is 34.

The square root of 219985 is about 469.0255856560. The cubic root of 219985 is about 60.3667353344.

The spelling of 219985 in words is "two hundred nineteen thousand, nine hundred eighty-five".