220439 has 4 divisors (see below), whose sum is σ = 233424. Its totient is φ = 207456.

The previous prime is 220421. The next prime is 220447. The reversal of 220439 is 934022.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220439 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 220439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220469) 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, 6467 + ... + 6500.

It is an arithmetic number, because the mean of its divisors is an integer number (58356).

2²²⁰⁴³⁹ is an apocalyptic number.

220439 is a deficient number, since it is larger than the sum of its proper divisors (12985).

220439 is a wasteful number, since it uses less digits than its factorization.

220439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12984.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 220439 is about 469.5093183314. The cubic root of 220439 is about 60.4082346272.

It can be divided in two parts, 220 and 439, that multiplied together give a triangular number (96580 = T₄₃₉).

The spelling of 220439 in words is "two hundred twenty thousand, four hundred thirty-nine".