218039 has 4 divisors (see below), whose sum is σ = 219024. Its totient is φ = 217056.

The previous prime is 218021. The next prime is 218047. The reversal of 218039 is 930812.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 218039 - 2¹² = 213943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218069) 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, 14 + ... + 660.

It is an arithmetic number, because the mean of its divisors is an integer number (54756).

2²¹⁸⁰³⁹ is an apocalyptic number.

218039 is a deficient number, since it is larger than the sum of its proper divisors (985).

218039 is an equidigital number, since it uses as much as digits as its factorization.

218039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 984.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 218039 is about 466.9464637408. The cubic root of 218039 is about 60.1882053250.

It can be divided in two parts, 21803 and 9, that added together give a palindrome (21812).

The spelling of 218039 in words is "two hundred eighteen thousand, thirty-nine".