840222 has 12 divisors (see below), whose sum is σ = 1820520. Its totient is φ = 280068.

The previous prime is 840197. The next prime is 840223. The reversal of 840222 is 222048.

840222 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 46679 = 840222 / (8 + 4 + 0 + 2 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 840195 and 840204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840223) by changing a digit.

840222 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23322 + ... + 23357.

It is an arithmetic number, because the mean of its divisors is an integer number (151710).

2⁸⁴⁰²²² is an apocalyptic number.

840222 is an abundant number, since it is smaller than the sum of its proper divisors (980298).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

840222 is a wasteful number, since it uses less digits than its factorization.

840222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46687 (or 46684 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 840222 is about 916.6362419193. The cubic root of 840222 is about 94.3621910017.

The spelling of 840222 in words is "eight hundred forty thousand, two hundred twenty-two".