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222865 = 529253
BaseRepresentation
bin110110011010010001
3102022201021
4312122101
524112430
64435441
71615516
oct663221
9368637
10222865
11142495
12a8b81
137a596
145b30d
154607a
hex36691

222865 has 12 divisors (see below), whose sum is σ = 282204. Its totient is φ = 168896.

The previous prime is 222863. The next prime is 222877. The reversal of 222865 is 568222.

222865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 1024 + 221841 = 32^2 + 471^2 .

It is not a de Polignac number, because 222865 - 21 = 222863 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a nialpdrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222863) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4179 + ... + 4231.

It is an arithmetic number, because the mean of its divisors is an integer number (23517).

2222865 is an apocalyptic number.

It is an amenable number.

222865 is a deficient number, since it is larger than the sum of its proper divisors (59339).

222865 is an equidigital number, since it uses as much as digits as its factorization.

222865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116 (or 87 counting only the distinct ones).

The product of its digits is 1920, while the sum is 25.

The square root of 222865 is about 472.0857972869. The cubic root of 222865 is about 60.6290304473.

Adding to 222865 its product of digits (1920), we get a triangular number (224785 = T670).

The spelling of 222865 in words is "two hundred twenty-two thousand, eight hundred sixty-five".

Divisors: 1 5 29 53 145 265 841 1537 4205 7685 44573 222865