228723 has 16 divisors (see below), whose sum is σ = 345600. Its totient is φ = 133280.

The previous prime is 228713. The next prime is 228731. The reversal of 228723 is 327822.

228723 is nontrivially palindromic in base 14 and base 16.

It is a cyclic number.

It is not a de Polignac number, because 228723 - 2⁴ = 228707 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 228693 and 228702.

It is not an unprimeable number, because it can be changed into a prime (228713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 838 + ... + 1076.

It is an arithmetic number, because the mean of its divisors is an integer number (21600).

2²²⁸⁷²³ is an apocalyptic number.

228723 is a deficient number, since it is larger than the sum of its proper divisors (116877).

228723 is a wasteful number, since it uses less digits than its factorization.

228723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282.

The product of its digits is 1344, while the sum is 24.

The square root of 228723 is about 478.2499346576. The cubic root of 228723 is about 61.1556537212.

Subtracting 228723 from its reverse (327822), we obtain a palindrome (99099).

The spelling of 228723 in words is "two hundred twenty-eight thousand, seven hundred twenty-three".