840228 has 12 divisors (see below), whose sum is σ = 1960560. Its totient is φ = 280072.

The previous prime is 840223. The next prime is 840239. The reversal of 840228 is 822048.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors.

It is a plaindrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 840198 and 840207.

It is not an unprimeable number, because it can be changed into a prime (840223) 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, 34998 + ... + 35021.

It is an arithmetic number, because the mean of its divisors is an integer number (163380).

2⁸⁴⁰²²⁸ is an apocalyptic number.

It is an amenable number.

840228 is an abundant number, since it is smaller than the sum of its proper divisors (1120332).

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

840228 is a wasteful number, since it uses less digits than its factorization.

840228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70026 (or 70024 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 840228 is about 916.6395147494. The cubic root of 840228 is about 94.3624156137.

The spelling of 840228 in words is "eight hundred forty thousand, two hundred twenty-eight".