228205823 has 4 divisors (see below), whose sum is σ = 229012488. Its totient is φ = 227399160.

The previous prime is 228205781. The next prime is 228205871. The reversal of 228205823 is 328502822.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 228205823 - 2⁶ = 228205759 is a prime.

It is a super-2 number, since 2×228205823² = 104155795302214658, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 228205823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228205883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 402908 + ... + 403473.

It is an arithmetic number, because the mean of its divisors is an integer number (57253122).

Almost surely, 2^228205823 is an apocalyptic number.

228205823 is a deficient number, since it is larger than the sum of its proper divisors (806665).

228205823 is an equidigital number, since it uses as much as digits as its factorization.

228205823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 806664.

The product of its (nonzero) digits is 15360, while the sum is 32.

The square root of 228205823 is about 15106.4828136797. The cubic root of 228205823 is about 611.0952490122.

The spelling of 228205823 in words is "two hundred twenty-eight million, two hundred five thousand, eight hundred twenty-three".