228323821 has 8 divisors (see below), whose sum is σ = 263732544. Its totient is φ = 195357120.

The previous prime is 228323819. The next prime is 228323839. The reversal of 228323821 is 128323822.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 228323821 - 2¹ = 228323819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228323881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 610305 + ... + 610678.

It is an arithmetic number, because the mean of its divisors is an integer number (32966568).

Almost surely, 2^228323821 is an apocalyptic number.

It is an amenable number.

228323821 is a deficient number, since it is larger than the sum of its proper divisors (35408723).

228323821 is a wasteful number, since it uses less digits than its factorization.

228323821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1221011.

The product of its digits is 9216, while the sum is 31.

The square root of 228323821 is about 15110.3878507469. The cubic root of 228323821 is about 611.2005568604.

Subtracting from 228323821 its reverse (128323822), we obtain a palindrome (99999999).

The spelling of 228323821 in words is "two hundred twenty-eight million, three hundred twenty-three thousand, eight hundred twenty-one".