2178228 has 24 divisors (see below), whose sum is σ = 5473888. Its totient is φ = 670176.

The previous prime is 2178223. The next prime is 2178257. The reversal of 2178228 is 8228712.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 2178195 and 2178204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2178223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6826 + ... + 7137.

2^2178228 is an apocalyptic number.

It is an amenable number.

2178228 is an abundant number, since it is smaller than the sum of its proper divisors (3295660).

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

2178228 is a wasteful number, since it uses less digits than its factorization.

2178228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13983 (or 13981 counting only the distinct ones).

The product of its digits is 3584, while the sum is 30.

The square root of 2178228 is about 1475.8821091131. The cubic root of 2178228 is about 129.6286840183.

Adding to 2178228 its product of digits (3584), we get a palindrome (2181812).

The spelling of 2178228 in words is "two million, one hundred seventy-eight thousand, two hundred twenty-eight".