128938229 has 8 divisors (see below), whose sum is σ = 151340928. Its totient is φ = 107531280.

The previous prime is 128938223. The next prime is 128938231. The reversal of 128938229 is 922839821.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128938229 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128938229.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128938223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 248657 + ... + 249174.

It is an arithmetic number, because the mean of its divisors is an integer number (18917616).

Almost surely, 2^128938229 is an apocalyptic number.

It is an amenable number.

128938229 is a deficient number, since it is larger than the sum of its proper divisors (22402699).

128938229 is an equidigital number, since it uses as much as digits as its factorization.

128938229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497875.

The product of its digits is 124416, while the sum is 44.

The square root of 128938229 is about 11355.0970493431. The cubic root of 128938229 is about 505.1967719933.

The spelling of 128938229 in words is "one hundred twenty-eight million, nine hundred thirty-eight thousand, two hundred twenty-nine".