228945821 has 12 divisors (see below), whose sum is σ = 249887232. Its totient is φ = 209650896.

The previous prime is 228945799. The next prime is 228945823. The reversal of 228945821 is 128549822.

It is a happy number.

It is not a de Polignac number, because 228945821 - 2²² = 224751517 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228945823) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16130 + ... + 26796.

It is an arithmetic number, because the mean of its divisors is an integer number (20823936).

Almost surely, 2^228945821 is an apocalyptic number.

It is an amenable number.

228945821 is a deficient number, since it is larger than the sum of its proper divisors (20941411).

228945821 is a wasteful number, since it uses less digits than its factorization.

228945821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10820 (or 10807 counting only the distinct ones).

The product of its digits is 92160, while the sum is 41.

The square root of 228945821 is about 15130.9557199801. The cubic root of 228945821 is about 611.7550647071.

The spelling of 228945821 in words is "two hundred twenty-eight million, nine hundred forty-five thousand, eight hundred twenty-one".