228729 has 4 divisors (see below), whose sum is σ = 304976. Its totient is φ = 152484.

The previous prime is 228713. The next prime is 228731. The reversal of 228729 is 927822.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 228729 - 2⁴ = 228713 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 228696 and 228705.

It is not an unprimeable number, because it can be changed into a prime (228799) 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 3 ways as a sum of consecutive naturals, for example, 38119 + ... + 38124.

It is an arithmetic number, because the mean of its divisors is an integer number (76244).

2²²⁸⁷²⁹ is an apocalyptic number.

It is an amenable number.

228729 is a deficient number, since it is larger than the sum of its proper divisors (76247).

228729 is an equidigital number, since it uses as much as digits as its factorization.

228729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76246.

The product of its digits is 4032, while the sum is 30.

The square root of 228729 is about 478.2562074872. The cubic root of 228729 is about 61.1561884739.

The spelling of 228729 in words is "two hundred twenty-eight thousand, seven hundred twenty-nine".