228440 has 16 divisors (see below), whose sum is σ = 514080. Its totient is φ = 91360.

The previous prime is 228427. The next prime is 228443. The reversal of 228440 is 44822.

228440 is digitally balanced in base 3, 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 (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228443) 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, 2816 + ... + 2895.

It is an arithmetic number, because the mean of its divisors is an integer number (32130).

2²²⁸⁴⁴⁰ is an apocalyptic number.

228440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

228440 is an abundant number, since it is smaller than the sum of its proper divisors (285640).

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

228440 is a wasteful number, since it uses less digits than its factorization.

228440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5722 (or 5718 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 228440 is about 477.9539726794. The cubic root of 228440 is about 61.1304205892.

The spelling of 228440 in words is "two hundred twenty-eight thousand, four hundred forty".