220839 has 4 divisors (see below), whose sum is σ = 294456. Its totient is φ = 147224.

The previous prime is 220811. The next prime is 220841. The reversal of 220839 is 938022.

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

It is a cyclic number.

It is not a de Polignac number, because 220839 - 2⁵ = 220807 is a prime.

It is a D-number.

220839 is a lucky number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220859) 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, 36804 + ... + 36809.

It is an arithmetic number, because the mean of its divisors is an integer number (73614).

2²²⁰⁸³⁹ is an apocalyptic number.

220839 is a deficient number, since it is larger than the sum of its proper divisors (73617).

220839 is an equidigital number, since it uses as much as digits as its factorization.

220839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73616.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 220839 is about 469.9351019024. The cubic root of 220839 is about 60.4447506903. Note that the first 3 decimals are identical.

The spelling of 220839 in words is "two hundred twenty thousand, eight hundred thirty-nine".