420228 has 30 divisors (see below), whose sum is σ = 1099406. Its totient is φ = 139968.

The previous prime is 420221. The next prime is 420241. The reversal of 420228 is 822024.

It can be written as a sum of positive squares in only one way, i.e., 419904 + 324 = 648^2 + 18^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 420228.

It is not an unprimeable number, because it can be changed into a prime (420221) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 325 + ... + 972.

2⁴²⁰²²⁸ is an apocalyptic number.

It is an amenable number.

420228 is an abundant number, since it is smaller than the sum of its proper divisors (679178).

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

420228 is a wasteful number, since it uses less digits than its factorization.

420228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1313 (or 1302 counting only the distinct ones).

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

The square root of 420228 is about 648.2499517933. The cubic root of 420228 is about 74.9022727137.

The spelling of 420228 in words is "four hundred twenty thousand, two hundred twenty-eight".