128229 has 4 divisors (see below), whose sum is σ = 170976. Its totient is φ = 85484.

The previous prime is 128221. The next prime is 128237. The reversal of 128229 is 922821.

128229 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

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 an interprime number because it is at equal distance from previous prime (128221) and next prime (128237).

It is a cyclic number.

It is not a de Polignac number, because 128229 - 2³ = 128221 is a prime.

It is a D-number.

128229 is strictly pandigital in base 7.

128229 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 128199 and 128208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21369 + ... + 21374.

It is an arithmetic number, because the mean of its divisors is an integer number (42744).

2¹²⁸²²⁹ is an apocalyptic number.

It is an amenable number.

128229 is a deficient number, since it is larger than the sum of its proper divisors (42747).

128229 is an equidigital number, since it uses as much as digits as its factorization.

128229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42746.

The product of its digits is 576, while the sum is 24.

The square root of 128229 is about 358.0907706155. The cubic root of 128229 is about 50.4268784573.

The spelling of 128229 in words is "one hundred twenty-eight thousand, two hundred twenty-nine".