219989 has 8 divisors (see below), whose sum is σ = 274368. Its totient is φ = 171360.

The previous prime is 219983. The next prime is 220009. The reversal of 219989 is 989912.

219989 = 22² + 23² + ... + 87².

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

It is not a de Polignac number, because 219989 - 2¹² = 215893 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (219983) 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 7 ways as a sum of consecutive naturals, for example, 1352 + ... + 1505.

It is an arithmetic number, because the mean of its divisors is an integer number (34296).

2²¹⁹⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

219989 is a deficient number, since it is larger than the sum of its proper divisors (54379).

219989 is a wasteful number, since it uses less digits than its factorization.

219989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2875.

The product of its digits is 11664, while the sum is 38.

The square root of 219989 is about 469.0298497964. The cubic root of 219989 is about 60.3671012161.

It can be divided in two parts, 2 and 19989, that added together give a palindrome (19991).

The spelling of 219989 in words is "two hundred nineteen thousand, nine hundred eighty-nine".