220849 has 4 divisors (see below), whose sum is σ = 221940. Its totient is φ = 219760.

The previous prime is 220841. The next prime is 220859. The reversal of 220849 is 948022.

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 can be written as a sum of positive squares in 2 ways, for example, as 34225 + 186624 = 185^2 + 432^2 .

It is a cyclic number.

It is not a de Polignac number, because 220849 - 2³ = 220841 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 (220841) 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, 142 + ... + 679.

It is an arithmetic number, because the mean of its divisors is an integer number (55485).

2²²⁰⁸⁴⁹ is an apocalyptic number.

It is an amenable number.

220849 is a deficient number, since it is larger than the sum of its proper divisors (1091).

220849 is an equidigital number, since it uses as much as digits as its factorization.

220849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1090.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 220849 is about 469.9457415490. The cubic root of 220849 is about 60.4456630267.

The spelling of 220849 in words is "two hundred twenty thousand, eight hundred forty-nine".